General Physics 2 - First Semester (1st Quarter)
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Questions and Answers

Which of the following is true about Gauss' Law?

  • The electric flux is equal to the electric field multiplied by the charge inside the surface.
  • The magnitude of the flux is the product of the electric field and the area of the surface.
  • The electric field is directed perpendicular to the surface.
  • The electric flux through any closed surface is proportional to the charge inside the surface. (correct)

    • What is the formula for calculating the electrical force of repulsion between two charges?

  • $F = k \frac{q_1 q_2}{r}$
  • $F = \frac{k}{q_1 q_2 r}$
  • $F = k \frac{q_1 q_2}{r^2}$ (correct)
  • $F = \frac{k}{q_1 q_2 r^2}$

    • What is the formula for calculating the magnitude of two charges when the force between them is known?

  • $q = \sqrt{\frac{F}{k} \cdot r}$
  • $q = \frac{F \cdot r}{k}$
  • $q = \sqrt{\frac{F \cdot r}{k}}$ (correct)
  • $q = \frac{F}{k \cdot r}$

    • What is the formula for calculating the separation distance between two balloons with known charges when the attracting force is known?

    <p>$d = \sqrt{\frac{F \cdot q_1 q_2}{k}}$</p> Signup and view all the answers

    What did Benjamin Franklin discover?

    <p>Electricity</p> Signup and view all the answers

    According to Gauss' Law, the electric flux through any closed surface is proportional to

    <p>The charge inside the surface</p> Signup and view all the answers

    What is the formula for calculating the electrical force of repulsion between two charges?

    <p>$F = k\frac{q_1q_2}{r^2}$</p> Signup and view all the answers

    What is the formula for calculating the separation distance between two balloons with known charges when the attracting force is known?

    <p>$r = \sqrt{\frac{kq_1q_2}{F}}$</p> Signup and view all the answers

    According to Gauss' Law, the electric flux through any closed surface is proportional to

    <p>the charge inside the surface</p> Signup and view all the answers

    What is the formula for calculating the electrical force of repulsion between two charges?

    <p>$F = k\frac{q_1 q_2}{r^2}$</p> Signup and view all the answers

    What is the formula for calculating the separation distance between two balloons with known charges when the attracting force is known?

    <p>$r = \sqrt{\frac{k q_1 q_2}{F}}$</p> Signup and view all the answers

    Which of the following is true about electric potential energy?

    <p>It depends on the charge of the object experiencing the electric field.</p> Signup and view all the answers

    What is the unit of charge?

    <p>Coulomb</p> Signup and view all the answers

    What is the unit of capacitance?

    <p>Farad</p> Signup and view all the answers

    What is the unit of mass?

    <p>Kilogram</p> Signup and view all the answers

    What is the unit of distance?

    <p>Meter</p> Signup and view all the answers

    Which of the following is true about capacitors?

    <p>Capacitors store electrical energy in an electric field.</p> Signup and view all the answers

    What is the unit of electric potential?

    <p>Volt</p> Signup and view all the answers

    What is the formula for calculating electric potential?

    <p>$V = \frac{Q}{C}$</p> Signup and view all the answers

    Which one of these is the formula for calculating electric potential?

    <p>$V = \frac{1}{4\pi\epsilon_0} \frac{q}{r}$</p> Signup and view all the answers

    Which one of these is the unit of distance?

    <p>Meter</p> Signup and view all the answers

    Which one of these is true about capacitors?

    <p>Capacitors store electrical energy in an electric field.</p> Signup and view all the answers

    Which one of these is the formula for calculating electric potential energy?

    <p>$PE = rac{1}{2}CV^2$</p> Signup and view all the answers

    Which one of these is the unit of electric potential?

    <p>Volt</p> Signup and view all the answers

    According to Gauss' Law, the electric flux through any closed surface is proportional to

    <p>The charge enclosed by the surface</p> Signup and view all the answers

    Which of the following is the correct formula for calculating the total resistance in a circuit?

    <p>$R_T = R1 + R2 + R3 + R$</p> Signup and view all the answers

    Which of the following is the correct formula for calculating the current in a circuit?

    <p>$I = \frac{V}{R}$</p> Signup and view all the answers

    What is the value of $V_1$ in volts if the current flowing through a 6Ω resistor is 2A?

    <p>12V</p> Signup and view all the answers

    What is the current flowing through a 8Ω resistor if the voltage across it is 30V?

    <p>3.75A</p> Signup and view all the answers

    What is the total current in a circuit if the currents flowing through three resistors are 7.5A, 5A, and 3.75A?

    <p>16.25A</p> Signup and view all the answers

    Which of the following is true about Ohm's Law?

    <p>The current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to its resistance.</p> Signup and view all the answers

    Which of the following is the correct formula for calculating the total resistance in a circuit?

    <p>$R_T = R_1 + R_2 + R_3$</p> Signup and view all the answers

    What is the formula for calculating the current in a circuit?

    <p>$I = \frac{V}{R}$</p> Signup and view all the answers

    Which of the following is the correct formula for calculating the total resistance in a circuit?

    <p>$R_T = R1 + R2 + R3 + R$</p> Signup and view all the answers

    What is the current flowing through a 8Ω resistor if the voltage across it is 30V?

    <p>$I = V / R = 30V / 8Ω = 3.75A$</p> Signup and view all the answers

    What is the value of $V_1$ in volts if the current flowing through a 6Ω resistor is 2A?

    <p>$V_1 = I \cdot R = 2A \cdot 6Ω = 12V$</p> Signup and view all the answers

    Which hand rule states that to determine the direction of the magnetic force on a positive moving charge, point the thumb of the right hand in the direction of v, the fingers in the direction of B, and a perpendicular to the palm points in the direction of F?

    <p>Right hand rule</p> Signup and view all the answers

    What is the largest magnet on Earth?

    <p>The Earth itself</p> Signup and view all the answers

    Which magnetic pole of a compass needle is attracted to the south magnetic pole of a second magnet?

    <p>North magnetic pole</p> Signup and view all the answers

    What is the direction of the Earth's north geographic pole in relation to its south magnetic pole?

    <p>They are opposite</p> Signup and view all the answers

    What is the direction of the magnetic force on a positive moving charge according to the right hand rule?

    <p>In the direction of F</p> Signup and view all the answers

    According to the right hand rule, to determine the direction of the magnetic force on a positive moving charge, which finger(s) should point in the direction of the magnetic field?

    <p>Middle finger</p> Signup and view all the answers

    Which pole of a compass needle is attracted to the south magnetic pole of a second magnet?

    <p>North pole</p> Signup and view all the answers

    What is the largest magnet on Earth?

    <p>The Earth itself</p> Signup and view all the answers

    Which hand rule states that to determine the direction of the magnetic force on a positive moving charge, point the thumb of the right hand in the direction of $v$, the fingers in the direction of $B$, and a perpendicular to the palm points in the direction of $F$?

    <p>Right Hand Rule</p> Signup and view all the answers

    What is the largest magnet on Earth?

    <p>The Earth itself</p> Signup and view all the answers

    Which pole of a compass needle is attracted to the south magnetic pole of a second magnet?

    <p>North pole</p> Signup and view all the answers

    According to Faraday's law of electromagnetic induction, a changing magnetic field is necessary to induce a current in a nearby circuit. This was demonstrated by Michael Faraday in his experiment using a coil and a magnet. Which of the following is the correct formula for calculating the induced back emf in volts?

    <p>E = L \cdot \Delta I \cdot \Delta t</p> Signup and view all the answers

    Lenz's law states that the direction of an induced emf will be such that if it were to cause a current to flow in a conductor in an external circuit, then that current would generate a field that would oppose the change that created it. Which of the following is the correct formula for calculating the induced current in a wire if the total resistance is known?

    <p>I = \frac{E},{R}</p> Signup and view all the answers

    Magnetic flux is defined as the number of magnetic field lines passing through a given closed surface. Which of the following is the correct formula for calculating the magnetic flux?

    <p>\Phi = B \cdot A \cdot \cos(\theta)</p> Signup and view all the answers

    Inductance is a current generated in a conductor by a changing magnetic field that is proportional to the rate of change of the magnetic field. Which of the following is the correct unit of inductance?

    <p>Henry (H)</p> Signup and view all the answers

    A circular loop of wire with a radius of 25cm is perpendicular to a magnetic field which increases from 1.5 T to 4.8 T in 23ms. What is the change in magnetic flux?

    <p>0.65 wb</p> Signup and view all the answers

    According to Faraday's law of electromagnetic induction, a changing magnetic field is necessary to induce a current in a nearby circuit. Which of the following is the correct formula for calculating the induced back emf in volts?

    <p>E = L \cdot \Delta I \cdot \Delta t</p> Signup and view all the answers

    What is the formula for calculating the change in magnetic flux?

    <p>\Phi = B \cdot A \cdot \cos(\theta)</p> Signup and view all the answers

    A circular loop of wire with a radius of 25cm is perpendicular to a magnetic field which increases from 1.5 T to 4.8 T in 23ms. What is the induced emf?

    <p>-28.26 V</p> Signup and view all the answers

    According to Lenz's law, the direction of an induced emf will be such that if it were to cause a current to flow in a conductor in an external circuit, then that current would generate a field that would ________ the change that created it.

    <p>oppose</p> Signup and view all the answers

    What is the formula for calculating inductance?

    <p>L = NΦ/Δt</p> Signup and view all the answers

    What is the formula for calculating the induced back emf in volts?

    <p>E = LΔI/Δt</p> Signup and view all the answers

    Which of the following is true about electromagnetic induction according to Faraday's law?

    <p>A changing magnetic field is necessary to induce a current in a nearby circuit.</p> Signup and view all the answers

    What is the formula for calculating the change in magnetic flux?

    <p>Φ = B A cos(θ)</p> Signup and view all the answers

    What is the formula for calculating the induced back emf in volts?

    <p>E = - L ΔI/Δt</p> Signup and view all the answers

    Which of the following is true about the reactance of a capacitor?

    <p>The reactance of a capacitor is expressed in ohms and symbolized by the letter X.</p> Signup and view all the answers

    What is the relationship between the reactance of a capacitor and the frequency of the alternating current?

    <p>The reactance of a capacitor is inversely proportional to the frequency of the alternating current.</p> Signup and view all the answers

    What is the general formula for the reactance of a capacitor?

    <p>$X = \frac{1}{2\pi fC}$</p> Signup and view all the answers

    What is the general formula for calculating the AC through a capacitor?

    <p>$I = \frac{V}{X}$</p> Signup and view all the answers

    How does the current through a capacitor change with faster-changing voltages?

    <p>The current through a capacitor increases with faster-changing voltages.</p> Signup and view all the answers

    Which of the following is true about the reactance of a capacitor?

    <p>The reactance of a capacitor is inversely proportional to the frequency of the alternating current.</p> Signup and view all the answers

    Which of the following is the general formula for calculating the reactance of a capacitor?

    <p>$X = \frac{1}{2\pi fC}$</p> Signup and view all the answers

    Which of the following is true about the current through a capacitor in an AC circuit?

    <p>The current through a capacitor is inversely proportional to the voltage across it.</p> Signup and view all the answers

    Which of the following is true about the reactance of a capacitor in an AC circuit?

    <p>The reactance of a capacitor is inversely proportional to the frequency of the alternating current.</p> Signup and view all the answers

    Which of the following is true about the current through a capacitor in an AC circuit?

    <p>The current through a capacitor is directly proportional to the rate of voltage change.</p> Signup and view all the answers

    Which of the following is the correct formula for calculating the reactance of a capacitor?

    <p>$X_C = \frac{1}{2 \pi f C}$</p> Signup and view all the answers

    Study Notes

    Electromagnetism

    • Gauss' Law states that the electric flux through any closed surface is proportional to the charge enclosed within that surface.

    Electric Force and Potential

    • The formula for calculating the electrical force of repulsion between two charges is F = k * (q1 * q2) / r^2, where F is the force, k is Coulomb's constant, q1 and q2 are the charges, and r is the distance between them.
    • The formula for calculating the magnitude of two charges when the force between them is known is q1 * q2 = F * r^2 / k.
    • The formula for calculating the separation distance between two balloons with known charges when the attracting force is known is r = sqrt(F * k / (q1 * q2)).
    • Benjamin Franklin discovered the connection between lightning and electricity.

    Capacitance

    • The unit of capacitance is the Farad (F).
    • The unit of electric potential is the Volt (V).
    • The formula for calculating electric potential is V = k * Q / r, where V is the potential, k is Coulomb's constant, Q is the charge, and r is the distance.

    Resistance and Ohm's Law

    • The unit of mass is the kilogram (kg).
    • The unit of distance is the meter (m).
    • Ohm's Law states that V = I * R, where V is the voltage, I is the current, and R is the resistance.
    • The formula for calculating the total resistance in a circuit is R_total = R1 + R2 + ... + Rn, where R_total is the total resistance, and R1, R2, ..., Rn are the resistances of individual resistors.
    • The formula for calculating the current in a circuit is I = V / R, where I is the current, V is the voltage, and R is the resistance.

    Magnetism and Electromagnetic Induction

    • The largest magnet on Earth is the Earth itself.
    • The right-hand rule states that to determine the direction of the magnetic force on a positive moving charge, point the thumb of the right hand in the direction of v, the fingers in the direction of B, and a perpendicular to the palm points in the direction of F.
    • According to Faraday's law of electromagnetic induction, a changing magnetic field is necessary to induce a current in a nearby circuit.
    • The formula for calculating the induced back emf in volts is ∊ = -N * ΔΦ / Δt, where ∊ is the induced emf, N is the number of turns, ΔΦ is the change in magnetic flux, and Δt is the time.
    • Lenz's law states that the direction of an induced emf will be such that if it were to cause a current to flow in a conductor in an external circuit, then that current would generate a field that would oppose the change that created it.
    • The unit of inductance is the Henry (H).
    • The formula for calculating the change in magnetic flux is ΔΦ = Φ_f - Φ_i, where ΔΦ is the change in magnetic flux, Φ_f is the final magnetic flux, and Φ_i is the initial magnetic flux.

    Electromagnetic Induction and AC Circuits

    • The formula for calculating the reactance of a capacitor is X_C = 1 / (2 * π * f * C), where X_C is the reactance, f is the frequency, and C is the capacitance.
    • The reactance of a capacitor decreases as the frequency of the alternating current increases.
    • The formula for calculating the AC through a capacitor is I = V / X_C, where I is the current, V is the voltage, and X_C is the reactance.

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