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Q. What is the potential difference between two points A and B if the electric field is 5 N/C and the distance between them is 3 m?

A. 15 V
B. 5 V
C. 3 V
D. 0 V

Solution

Potential difference V = E * d = 5 N/C * 3 m = 15 V.

Correct Answer: A — 15 V

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Q. What is the potential difference between two points A and B in an electric field if the work done in moving a charge of +2C from A to B is 10J?

A. 5 V
B. 10 V
C. 20 V
D. 2 V

Solution

V = W/Q = 10 J / 2 C = 5 V.

Correct Answer: B — 10 V

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Q. What is the potential difference between two points A and B in an electric field if the work done in moving a charge of 5μC from A to B is 10mJ?

A. 2V
B. 5V
C. 10V
D. 20V

Solution

Potential difference V = W/Q = 10mJ / 5μC = 10 × 10^-3 J / 5 × 10^-6 C = 2V.

Correct Answer: B — 5V

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Q. What is the potential difference between two points A and B in an electric field if the work done in moving a charge of 5μC from A to B is 0.02 J?

A. 4 V
B. 2 V
C. 10 V
D. 0.1 V

Solution

Potential difference V = W/Q = 0.02 J / (5 × 10^-6 C) = 4000 V = 4 V.

Correct Answer: A — 4 V

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Q. What is the potential difference between two points A and B in an electric field of 200 N/C if the distance between them is 0.5 m?

A. 100 V
B. 200 V
C. 50 V
D. 25 V

Solution

Potential difference V = E * d = 200 N/C * 0.5 m = 100 V.

Correct Answer: A — 100 V

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Q. What is the potential difference between two points in a uniform electric field of strength 200 N/C separated by 3m?

A. 600 V
B. 200 V
C. 300 V
D. 400 V

Solution

V = E * d = 200 N/C * 3 m = 600 V.

Correct Answer: A — 600 V

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Q. What is the potential difference between two points in an electric field if the work done to move a charge of 2C is 10J?

A. 5V
B. 20V
C. 2V
D. 10V

Solution

Potential difference V = W/Q = 10J / 2C = 5V.

Correct Answer: B — 20V

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Q. What is the potential difference between two points in an electric field if the work done in moving a charge of +2μC between them is 0.04 J?

A. 20 V
B. 10 V
C. 5 V
D. 2 V

Solution

V = W/q = 0.04 J / (2 × 10^-6 C) = 20 V.

Correct Answer: A — 20 V

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Q. What is the potential difference between two points in an electric field if the work done in moving a charge of +2μC is 0.04 J?

A. 20 V
B. 10 V
C. 5 V
D. 2 V

Solution

Potential difference V = W/q = 0.04 J / (2 × 10^-6 C) = 20 V.

Correct Answer: A — 20 V

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Q. What is the potential difference between two points in an electric field if the work done to move a charge of 2μC is 0.04 J?

A. 20 V
B. 30 V
C. 40 V
D. 50 V

Solution

Potential difference V = W/q = 0.04 J / (2 × 10^-6 C) = 20,000 V = 20 V.

Correct Answer: C — 40 V

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Q. What is the potential difference between two points in an electric field if the work done in moving a charge of 3 C from one point to another is 15 J?

A. 5 V
B. 10 V
C. 15 V
D. 20 V

Solution

Potential difference V = Work done / Charge = 15 J / 3 C = 5 V.

Correct Answer: B — 10 V

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Q. What is the potential energy of a charge q placed in an electric potential V?

A. qV
B. q/V
C. V/q
D. q²V

Solution

The potential energy U of a charge q in an electric potential V is given by U = qV.

Correct Answer: A — qV

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Q. What is the potential energy of a dipole in a uniform electric field E when it is aligned with the field?

A. -pE
B. 0
C. pE
D. pE/2

Solution

Potential energy U = -p · E. When aligned, U = -pE.

Correct Answer: A — -pE

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Q. What is the potential energy of a mass of 5 kg at a height of 10 m in a gravitational field (g = 9.8 m/s²)?

A. 490 J
B. 980 J
C. 245 J
D. 50 J

Solution

Potential energy PE = mgh = 5 kg × 9.8 m/s² × 10 m = 490 J.

Correct Answer: B — 980 J

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Q. What is the potential energy of a system of two charges +3μC and +4μC separated by 0.2m?

A. 0.54 J
B. 0.72 J
C. 0.36 J
D. 0.18 J

Solution

U = k * (q1 * q2) / r = (9 × 10^9) * (3 × 10^-6 * 4 × 10^-6) / 0.2 = 0.54 J.

Correct Answer: B — 0.72 J

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Q. What is the potential energy of a system of two charges +3μC and +5μC separated by 0.2m?

A. -6.75 J
B. 6.75 J
C. 0.75 J
D. -0.75 J

Solution

Potential energy U = k * (q1 * q2) / r = (9 × 10^9) * (3 × 10^-6) * (5 × 10^-6) / 0.2 = 6.75 J.

Correct Answer: B — 6.75 J

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Q. What is the potential energy of a system of two charges +3μC and -5μC separated by 0.3m?

A. -0.45 J
B. 0.45 J
C. -0.15 J
D. 0.15 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9) * (3 × 10^-6) * (-5 × 10^-6) / 0.3 = -0.45 J.

Correct Answer: A — -0.45 J

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Q. What is the potential energy of a system of two charges +5μC and +10μC separated by 0.2m?

A. -0.225 J
B. 0.225 J
C. 0.45 J
D. 0.9 J

Solution

Potential energy U = k * (q1 * q2) / r = (9 × 10^9) * (5 × 10^-6) * (10 × 10^-6) / 0.2 = 0.225 J.

Correct Answer: B — 0.225 J

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Q. What is the potential energy of a system of two charges +q and +q separated by a distance r?

A. 0
B. k*q²/r
C. -k*q²/r
D. 2k*q²/r

Solution

Potential energy U = k * (q1 * q2) / r = k * (q * q) / r = k*q²/r.

Correct Answer: B — k*q²/r

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Q. What is the potential energy of a system of two charges of +1μC and -1μC separated by 0.1m?

A. -0.09 J
B. 0.09 J
C. -0.18 J
D. 0.18 J

Solution

Potential energy U = k * q1 * q2 / r = (9 × 10^9) * (1 × 10^-6) * (-1 × 10^-6) / 0.1 = -0.09 J.

Correct Answer: A — -0.09 J

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Q. What is the potential energy of a system of two point charges +q and -q separated by a distance r?

A. 0
B. kq²/r
C. -kq²/r
D. kq/r

Solution

The potential energy U of a system of two point charges is given by U = k(q1q2)/r = -kq²/r for +q and -q.

Correct Answer: C — -kq²/r

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Q. What is the potential energy of a system of two point charges q1 and q2 separated by a distance r?

A. k * q1 * q2 / r
B. k * q1 * q2 * r
C. k * (q1 + q2) / r
D. k * (q1 - q2) / r

Solution

The potential energy U of a system of two point charges is given by U = k * q1 * q2 / r.

Correct Answer: A — k * q1 * q2 / r

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Q. What is the potential energy stored in a spring when it is compressed by a distance x?

A. 1/2 kx
B. 1/2 kx²
C. kx
D. kx²

Solution

The potential energy (PE) stored in a spring is given by PE = 1/2 kx², where k is the spring constant and x is the displacement.

Correct Answer: B — 1/2 kx²

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Q. What is the power consumed by a 10 ohm resistor when a current of 2 A flows through it?

A. 20 W
B. 40 W
C. 10 W
D. 5 W

Solution

Power P = I^2 * R = (2 A)^2 * 10Ω = 4 * 10 = 40 W.

Correct Answer: B — 40 W

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Q. What is the power consumed by a 10 ohm resistor when a current of 3 A flows through it?

A. 30 W
B. 90 W
C. 60 W
D. 15 W

Solution

Power P = I^2 * R = (3 A)^2 * 10 ohms = 9 * 10 = 90 W.

Correct Answer: B — 90 W

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Q. What is the power consumed by a 10Ω resistor when a current of 2A flows through it?

A. 20W
B. 40W
C. 10W
D. 5W

Solution

Power P = I^2 * R = (2A)^2 * 10Ω = 4A^2 * 10Ω = 40W.

Correct Answer: A — 20W

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Q. What is the power consumed by a 12 V battery supplying a current of 2 A?

A. 24 W
B. 12 W
C. 6 W
D. 48 W

Solution

Power is given by P = V * I = 12 V * 2 A = 24 W.

Correct Answer: A — 24 W

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Q. What is the power consumed by a 5 ohm resistor carrying a current of 3 A?

A. 15 W
B. 9 W
C. 5 W
D. 3 W

Solution

Power P = I^2 * R = (3 A)^2 * 5 ohms = 9 * 5 = 45 W.

Correct Answer: A — 15 W

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Q. What is the power consumed by a 5 ohm resistor when a current of 2A flows through it?

A. 10W
B. 20W
C. 5W
D. 15W

Solution

Power P = I^2 * R = (2A)^2 * 5 ohms = 4 * 5 = 20W.

Correct Answer: B — 20W

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Q. What is the power consumed by a 5 ohm resistor when a current of 3 A flows through it?

A. 15 W
B. 9 W
C. 5 W
D. 3 W

Solution

Power P = I^2 * R = (3 A)^2 * 5 ohms = 9 * 5 = 45 W.

Correct Answer: A — 15 W

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