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

Which of the following best describes Gauss' law?

  • The force between two identical charges separated by a distance is equal to the product of the charges divided by the square of the distance.
  • The electric force between two charges is inversely proportional to the square of the distance between them.
  • The electric field directed perpendicular to the surface is the product of the electric field and the area of the surface.
  • The electric flux through any closed surface is proportional to the charge inside the surface. (correct)

    • What is the formula for electric flux?

  • $\Phi = EA$ (correct)
  • $\Phi = \frac{Q},{4\pi\epsilon_0 r^2}$
  • $\Phi = \frac{Q},{\epsilon_0}$
  • $\Phi = \frac{Q},{A}$

    • What is the formula for Coulomb's law?

  • $F = \frac{1},{4\pi\epsilon_0}\frac{q_1q_2},{r}$
  • $F = \frac{kq_1q_2},{r}$
  • $F = \frac{1},{4\pi\epsilon_0}\frac{q_1q_2},{r^2}$
  • $F = k\frac{q_1q_2},{r^2}$ (correct)

    • What is the formula for the electric field?

    <p>$E = \frac{F},{q}$</p> Signup and view all the answers

    What is the formula for the force between two charges?

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

    Which one of these correctly describes Gauss' law?

    <p>The electric flux through any closed surface is proportional to the charge inside the surface.</p> Signup and view all the answers

    What is the electrical force of repulsion between two charges of -1.5 x 10⁵ C separated by a distance of 0.34 m?

    <p>0.51 N</p> Signup and view all the answers

    What is the magnitude of the two charges if the force between them is 90 N and they are separated by 1 cm?

    <p>$1.5 \ imes 10^7$ C</p> Signup and view all the answers

    What is the separation distance between two balloons with charges of 3.37 x 10⁴ C and -8.21 x 10² C if they attract each other with a force of 0.0626 N?

    <p>0.3 m</p> Signup and view all the answers

    Which one of these is an important factor to consider when solving physics problems?

    <p>Analyzation and derivation of formula</p> Signup and view all the answers

    Which one of these best describes the electric flux?

    <p>The product of the electric field and the area of the surface</p> Signup and view all the answers

    What is the formula for 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 the magnitude of the two charges if the force between them is 90 N and they are separated by 1 cm?

    <p>$q = \sqrt{\frac{Fr^2}{k}}$</p> Signup and view all the answers

    What is the formula for the electric field?

    <p>$E = \frac{F}{q}$</p> Signup and view all the answers

    What is the separation distance between two balloons with charges of 3.37 x 10⁴ C and -8.21 x 10² C if they attract each other with a force of 0.0626 N?

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

    Which one of these is true about a capacitor?

    <p>It stores electrical energy in an 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 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

    What is the unit of capacitance?

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

    Which one of these correctly describes a capacitor?

    <p>A device that stores electrical energy in an electric field</p> Signup and view all the answers

    What is the formula for electric potential?

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

    What is the formula for voltage?

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

    What is the formula for work done in moving a charge in an electric field?

    <p>$W = QV$</p> Signup and view all the answers

    What is the formula for final speed of a charge moving in an electric field?

    <p>$v_f = \sqrt{2QEd/m}$</p> Signup and view all the answers

    Which one of these correctly describes a capacitor?

    <p>A device that stores electrical energy in an electric field</p> Signup and view all the answers

    What is the formula for Coulomb's law?

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

    What is the formula for electric flux?

    <p>$\Phi = \int \vec{E} \cdot \vec{dA}$</p> Signup and view all the answers

    What is the formula for electric potential?

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

    What is the unit of capacitance?

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

    Which one of these is the formula for calculating total resistance in a circuit?

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

    Which one of these is the formula for calculating current in a circuit?

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

    Which one of these is the formula for calculating voltage in a circuit?

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

    Which one of these is the formula for calculating the current flow on each resistor in a circuit?

    <p>$I_1 = \frac{V}{R_1}$, $I_2 = \frac{V}{R_2}$, $I_3 = \frac{V}{R_3}$</p> Signup and view all the answers

    Which one of these is the formula for calculating the total current in a circuit?

    <p>$I_T = I_1 + I_2 + I_3 + I$</p> Signup and view all the answers

    Which one of these correctly describes Ohm's law?

    <p>The relationship between current, voltage, and resistance.</p> Signup and view all the answers

    What is the formula for calculating current in a circuit?

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

    What is the formula for calculating the total resistance in a circuit?

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

    What is the formula for calculating the current flow on each resistor in a circuit?

    <p>$I_1 = \frac{V}{R_1}$, $I_2 = \frac{V}{R_2}$, $I_3 = \frac{V}{R_3}$</p> Signup and view all the answers

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

    <p>$I_T = I_1 + I_2 + I_3 + I$</p> Signup and view all the answers

    Which one of these is the formula for calculating the total resistance in a circuit?

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

    Which one of these is the formula for calculating the current in a circuit?

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

    Which one of these is the formula for calculating the voltage in a circuit?

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

    Which one of these is the formula for calculating the current flow on each resistor in a circuit?

    <p>$I_1 = \ rac{V},{R_1}$, $I_2 = \ rac{V},{R_2}$, $I_3 = \ rac{V},{R_3}$</p> Signup and view all the answers

    Which one of these is the formula for calculating the total current in a circuit?

    <p>$I_T = I_1 + I_2 + I_3 + I$</p> Signup and view all the answers

    Study Notes

    Electric Charges and Fields

    • Gauss' law describes the distribution of electric charge and the resulting electric field.
    • Electric flux is the measure of the electric field that passes through a given area, formula: Φ = EA.
    • Coulomb's law formula: F = k * (q1 * q2) / r^2, describes the electric force between two charged objects.

    Electric Force and Field

    • Electric force formula: F = k * (q1 * q2) / r^2, describes the force between two charges.
    • Electric field formula: E = k * Q / r^2, describes the electric field around a charged object.

    Capacitors and Circuits

    • Capacitors store energy in an electric field, formula: C = Q / V, describes the capacitance of a capacitor.
    • Capacitors have a specific capacitance (C) that depends on the material and geometry of the capacitor.
    • Ohm's law formula: I = V / R, describes the relationship between voltage, current, and resistance in a circuit.

    Units and Formulas

    • Unit of charge: Coulomb (C).
    • Unit of mass: Kilogram (kg).
    • Unit of distance: Meter (m).
    • Unit of capacitance: Farad (F).
    • Formula for electric potential: V = k * Q / r.
    • Formula for voltage: V = I * R.
    • Formula for work done in moving a charge: W = q * V.
    • Formula for final speed of a charge: v = sqrt(2 * (q / m) * V).

    Note: k is Coulomb's constant, Q is charge, r is distance, E is electric field, I is current, R is resistance, V is voltage, C is capacitance, m is mass.

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