Physics Chapter: Electrostatics and Inductance
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Questions and Answers

What is the charge on an electron?

  • +1.6 × 10–19
  • 1 × 10–19
  • -1.6 × 10–19 (correct)

    • What is the unit of charge in the SI system?

  • Farad
  • Volt
  • Ampere
  • Coulomb (correct)

    • Which of the following represents Coulomb's law?

  • $F = k \frac{q_1 q_2}{r^2}$ (correct)
  • $F = k \frac{q_1 q_2}{r}$
  • $F = k \frac{q_1 q_2}{r^3}$
  • $F = k \frac{q_1 + q_2}{r}$

    • What is the value of the constant K in Coulomb's law?

    <p>9 × 10^9 (D)</p> Signup and view all the answers

    What is the relationship between the electrostatic unit (esu) and the electromagnetic unit (emu) of charge?

    <p>1 esu = 3 × 10^9 emu (B)</p> Signup and view all the answers

    What is the formula for calculating the total inductance (LAB) of three inductors connected in series?

    <p>LAB = L1 + L2 + L3 (C)</p> Signup and view all the answers

    What is the value of F, in Farads?

    <p>1e-6 F (C)</p> Signup and view all the answers

    What is the relationship between inductance (L) and capacitance (C) in the given context?

    <p>There is no relationship between L and C in the context. (D)</p> Signup and view all the answers

    What is the correct formula for calculating the reciprocal of the inductance of an inductor in series with another inductor?

    <p>1 / (L1 + L2) (A)</p> Signup and view all the answers

    What is the unit of measurement for inductance?

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

    What is the power of an electric iron that has a voltage of 230V and a current of 10A?

    <p>2300 W (C)</p> Signup and view all the answers

    Which material is commonly used as a heating element in a toaster?

    <p>Nichrome (D)</p> Signup and view all the answers

    Which of the following is NOT an insulator?

    <p>Iron (A), Copper (C), Silver (D)</p> Signup and view all the answers

    Which of the following is used to control the temperature of an electric iron?

    <p>Thermistor (D)</p> Signup and view all the answers

    What is the EMF of a battery connected to a 20Ω resistor that produces a current of 0.75A?

    <p>15 V (A)</p> Signup and view all the answers

    What is the relationship between the temperature of a heating element and its resistance?

    <p>As temperature increases, resistance increases. (B)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of a good heating element?

    <p>High conductivity (C)</p> Signup and view all the answers

    What is the main component of a bimetallic strip?

    <p>Two different metals with different coefficients of thermal expansion. (B)</p> Signup and view all the answers

    What is the unit of electric current in the SI system?

    <p>Ampere (B)</p> Signup and view all the answers

    What is the unit of capacitance in the SI system?

    <p>Farad (A)</p> Signup and view all the answers

    What is the unit of magnetic field strength in the SI system?

    <p>Tesla (C)</p> Signup and view all the answers

    Which of the following is the symbol for electric current?

    <p>I (D)</p> Signup and view all the answers

    What is the SI unit of electromotive force?

    <p>Volt (A)</p> Signup and view all the answers

    Which of the following is the symbol for potential difference or voltage?

    <p>V (A)</p> Signup and view all the answers

    Which of the following is the symbol for resistance?

    <p>R (D)</p> Signup and view all the answers

    What value is displayed by the voltmeter in the given picture?

    <p>1 Volt (D)</p> Signup and view all the answers

    Which of the following units is equivalent to 1 kilowatt-hour?

    <p>36 * 10<sup>5 </sup>Joules (D)</p> Signup and view all the answers

    Which of the following is the symbol for capacitance?

    <p>C (A)</p> Signup and view all the answers

    Calculate the current flowing through the circuit, in Amps, given a voltage of 100V and an impedance of 10 ohms.

    <p>10 A (C)</p> Signup and view all the answers

    What is the correct formula for calculating power?

    <p>Power = Voltage * Current (B)</p> Signup and view all the answers

    Which of the following represents the unit of electric current density?

    <p>A/m^2 (B)</p> Signup and view all the answers

    Identify the component used for heating in an electric kettle.

    <p>Concealed wire in metal tube (D)</p> Signup and view all the answers

    What is the value of 1 kilowatt-hour (kWh) in watt-seconds?

    <p>36 * 10<sup>6 </sup>watt-seconds (D)</p> Signup and view all the answers

    What is the unit of impedance, as used in the context of the 100V, 50Hz circuit mentioned?

    <p>Ohms (A)</p> Signup and view all the answers

    Which of the following is the formula for calculating the potential difference across a resistor?

    <p>Voltage = Current * Resistance (B)</p> Signup and view all the answers

    What is the unit of power?

    <p>Watts (C)</p> Signup and view all the answers

    Which of the following is a common application of the voltage divider rule, as demonstrated in the circuit diagram?

    <p>Measuring the voltage across a specific component in a series circuit (C)</p> Signup and view all the answers

    What is the correct formula for calculating resistance?

    <p>Resistance = Voltage / Current (B)</p> Signup and view all the answers

    What is the correct formula for calculating the current flowing through a circuit?

    <p>Current = Voltage / Resistance (A)</p> Signup and view all the answers

    Study Notes

    Basic of Electricity

    • Atoms are the smallest unit of a substance that participates in chemical reactions.
    • Atoms consist of protons, neutrons, and electrons.
    • Protons have a positive charge (+1.6 × 10⁻¹⁹ Coulombs).
    • Electrons have a negative charge (-1.6 × 10⁻¹⁹ Coulombs).
    • Neutrons have no charge.
    • Free electrons are electrons in the outermost shell of most metals. These are more loosely bound to the nucleus than other electrons.
    • Free electrons enable charge to move through the conductor.
    • Current, in metals, flows due to free electrons whereas in ionic solutions like electrolytes, it flows through the ions.

    Charge

    • Charge is a property of matter which causes a substance to experience electrostatic attraction or repulsion.
    • The S.I. unit of charge is the Coulomb (C).
    • Charge can be positive or negative.

    Coulomb's Law

    • The electrostatic force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
    • F=k (q₁ q₂)/r²
    • k is Coulomb's constant (approximately 9 × 10⁹ N⋅m²/C²).
    • q₁ and q₂ are the magnitudes of the charges in Coulombs.
    • r is the distance between the charges in meters.

    Charge Density

    • Linear charge density (λ): charge per unit length (C/m)
    • Surface charge density (σ): charge per unit area (C/m²)
    • Volume charge density (ρ): charge per unit volume (C/m³)

    Electric Field

    • An electric field is the region around a charge where another charge experiences a force.
    • E = F/q
    • The S.I. unit of electric field intensity is N/C (Newton per Coulomb).

    Electric Potential

    • Electric potential is the work done per unit charge in bringing a unit positive charge from infinity to a point in the electric field.
    • V = W/q
    • The S.I. unit of electric potential is Joules per Coulomb (or Volt).

    Electric Current

    • Electric current is the rate of flow of charge.
    • I = Q/t, where I is current, Q is charge, and t is time.
    • The S.I. unit of current is the Ampere (C/s).

    Resistance

    • Resistance is a measure of how difficult it is for current to flow through a material.
    • R = V/I
    • The S.I. unit of resistance is the Ohm (Ω).

    Ohm's Law

    • In a conductor, the current that flows is directly proportional to the voltage and inversely proportional to the value of resistance.
    • I =V/R
    • The law is applicable to a resistor (conductor with a consistently proportional current-voltage relationship).

    Effects of Electric Current

    • Heating effect: The conversion of electrical energy into heat when current flows through a conductor. This is Joule's effect( H = I²Rt )
    • Magnetic effect: The creation of a magnetic field around a current-carrying conductor. This is used in motors and generators.
    • Chemical effect: The decomposition of certain chemical compounds when an electric current passes through them (Electrolysis). This is used in electroplating.

    Combinations of Resistances

    • Series: Resistances are connected end-to-end, resulting in an increased total resistance (Req=R1+R2+R3+...)

    • Parallel: Resistances are connected across each other, resulting in a decreased total resistance (1/Req = 1/R1 + 1/R2 + 1/R3+...)

    Combinations of Capacitors

    • Series: Capacitors are connected end-to-end, resulting in a decreased total capacitance (1/Ceq = 1/C1 + 1/C2 + 1/C3 +...)

    • Parallel: Capacitors are connected across each other, resulting in an increased total capacitance (Ceq = C1+C2+C3+...).

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    Test your knowledge on the fundamental concepts of electrostatics and inductance in this engaging quiz. Explore topics such as charge, Coulomb's law, and the behavior of inductors and capacitors. Perfect for students seeking to solidify their understanding of electrical engineering principles.

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