Electricity & Magnetism

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Q. A capacitor of capacitance 10 microfarads is charged to a voltage of 5 volts. What is the charge stored in the capacitor?
  • A. 50 microcoulombs
  • B. 5 microcoulombs
  • C. 0.5 microcoulombs
  • D. 100 microcoulombs
Q. A capacitor of capacitance 5 µF is charged to a voltage of 10V. What is the charge stored in the capacitor? (2022)
  • A. 50 µC
  • B. 100 µC
  • C. 500 µC
  • D. 1000 µC
Q. A capacitor stores 5 microfarads of charge at a voltage of 10 volts. What is the energy stored in the capacitor?
  • A. 0.25 mJ
  • B. 0.5 mJ
  • C. 0.75 mJ
  • D. 1 mJ
Q. A capacitor stores energy in the form of which type of field?
  • A. Electric field
  • B. Magnetic field
  • C. Gravitational field
  • D. Electromagnetic field
Q. If a 10 ohm resistor is connected to a 5V battery, what is the current flowing through the resistor? (2020)
  • A. 0.5 A
  • B. 1 A
  • C. 2 A
  • D. 5 A
Q. If a 12 V battery is connected to a resistor of 4 ohms, what is the current flowing through the circuit?
  • A. 3 A
  • B. 4 A
  • C. 12 A
  • D. 0.33 A
Q. If a circuit has a resistance of 5 ohms and a current of 2 amperes, what is the voltage across the circuit?
  • A. 10 V
  • B. 5 V
  • C. 2 V
  • D. 1 V
Q. If a wire carries a current of 3 A and has a resistance of 2 ohms, what is the power dissipated in the wire?
  • A. 6 W
  • B. 9 W
  • C. 12 W
  • D. 15 W
Q. If a wire carries a current of 4 A and has a resistance of 2 ohms, what is the power dissipated in the wire?
  • A. 8 W
  • B. 16 W
  • C. 4 W
  • D. 2 W
Q. If the frequency of an AC circuit is doubled, what happens to the inductive reactance?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the frequency of an AC signal is doubled, what happens to its period?
  • A. It doubles
  • B. It halves
  • C. It remains the same
  • D. It quadruples
Q. If the resistance of a conductor is doubled, what happens to the current if the voltage remains constant? (2020)
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Increases four times
Q. If the resistance of a wire is 10 ohms and the voltage across it is 20 volts, what is the current flowing through the wire?
  • A. 2 A
  • B. 5 A
  • C. 10 A
  • D. 20 A
Q. If the resistance of a wire is doubled, what happens to the current if the voltage remains constant? (2021)
  • A. Doubles
  • B. Halves
  • C. Remains the same
  • D. Increases
Q. If the voltage across a resistor is doubled, what happens to the power consumed by the resistor? (2020)
  • A. It halves
  • B. It doubles
  • C. It quadruples
  • D. It remains the same
Q. In a magnetic field, the direction of the magnetic force on a charged particle is given by which rule?
  • A. Right-hand rule
  • B. Left-hand rule
  • C. Fleming's right-hand rule
  • D. Fleming's left-hand rule
Q. In a parallel circuit with two resistors of 6 ohms and 3 ohms, what is the total resistance?
  • A. 2 ohms
  • B. 4 ohms
  • C. 1.5 ohms
  • D. 9 ohms
Q. In a parallel circuit, if one resistor fails, what happens to the rest of the circuit? (2022)
  • A. All resistors fail
  • B. Current stops flowing
  • C. The circuit remains functional
  • D. Voltage drops to zero
Q. In a parallel circuit, if one resistor fails, what happens to the total resistance? (2020)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes infinite
Q. In a series circuit with a 12 V battery and two resistors of 4 Ω and 8 Ω, what is the current flowing through the circuit?
  • A. 0.5 A
  • B. 1 A
  • C. 1.5 A
  • D. 2 A
Q. What happens to the total current in a parallel circuit if more branches are added? (2023)
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. What is the direction of the magnetic field around a current-carrying conductor? (2019)
  • A. From North to South
  • B. From South to North
  • C. Clockwise
  • D. Counterclockwise
Q. What is the equivalent resistance of two resistors of 4 ohms and 6 ohms connected in series?
  • A. 10 ohms
  • B. 24 ohms
  • C. 2.4 ohms
  • D. 0.67 ohms
Q. What is the equivalent resistance of two resistors of 4 ohms and 6 ohms in series?
  • A. 10 ohms
  • B. 24 ohms
  • C. 2.4 ohms
  • D. 0.67 ohms
Q. What is the equivalent resistance of two resistors, R1 = 4Ω and R2 = 6Ω, in parallel? (2022)
  • A. 2.4Ω
  • B. 10Ω
  • C. 24Ω
  • D. 1.5Ω
Q. What is the equivalent resistance of two resistors, R1 and R2, in parallel? (2022)
  • A. R1 + R2
  • B. R1 * R2 / (R1 + R2)
  • C. 1 / (1/R1 + 1/R2)
  • D. R1 - R2
Q. What is the formula for calculating electric power? (2023)
  • A. P = IV
  • B. P = I^2R
  • C. P = V^2/R
  • D. All of the above
Q. What is the formula for calculating the capacitance of a parallel plate capacitor?
  • A. C = εA/d
  • B. C = A/εd
  • C. C = d/εA
  • D. C = εd/A
Q. What is the formula for calculating the power consumed in an electrical circuit?
  • A. P = IV
  • B. P = I/R
  • C. P = V/R
  • D. P = IR
Q. What is the formula for the capacitance of a parallel plate capacitor?
  • A. C = εA/d
  • B. C = A/εd
  • C. C = d/εA
  • D. C = εd/A
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