Practice Test 1 Practice Tests

Question 1

An object has a net charge of -3.2 x 10^-17 C. How many excess electrons are present on the object? (Elementary charge, e = 1.60 x 10^-19 C)

Accepted Answer

200

Question 2

A charge of 2.4 x 10^-19 C is a possible charge that an object can possess.

Accepted Answer

True

Answer

False

Question 3

Two charged objects are placed near each other. If both objects have a negative charge, what will happen?

Accepted Answer

A. They will repel each other.

Answer

B. They will attract each other.

Answer

C. There will be no force between them.

Answer

D. They will exchange charges.

Question 4

Two point charges, q1 = +4 μC and q2 = -8 μC, are separated by a distance of 2 m. Calculate the magnitude of the electric force between them. (k = 9 x 10^9 Nm²/C²)

Accepted Answer

B. 0.072 N

Answer

A. 0.144 N

Answer

C. 0.036 N

Answer

D. 0.018 N

Question 5

A test charge of +2 μC experiences a force of 0.04 N in a certain electric field. What is the magnitude of the electric field at the location of the test charge?

Accepted Answer

20000 N/C

Question 6

A point charge of -5 nC is located at the origin. What is the magnitude of the electric field at a point 0.5 m away from the origin? (k = 9 x 10^9 Nm²/C²)

Accepted Answer

A. 180 N/C

Answer

B. 90 N/C

Answer

C. 45 N/C

Answer

D. 22.5 N/C

Question 7

A uniformly charged rod of length 2 m has a total charge of 8 μC. Calculate the linear charge density (λ) of the rod.

Accepted Answer

4 μC/m

Question 8

A uniform electric field of magnitude 5000 N/C passes through a flat surface with an area of 0.2 m². The angle between the electric field and the area vector is 60 degrees. Calculate the electric flux through the surface.

Accepted Answer

C. 500 Nm²/C

Answer

A. 1000 Nm²/C

Answer

B. 866 Nm²/C

Answer

D. 250 Nm²/C

Question 9

A charge of +2.0 $\mu$C is moved from point A to point B in an electric field. The change in electric potential energy is +5.0 $\mu$J. Calculate the electric potential difference, $\Delta V = V_B - V_A$, between points A and B.

Accepted Answer

2.5 V

Question 10

A parallel-plate capacitor has a capacitance of 10 pF and is charged to a potential difference of 100 V. What is the energy stored in the capacitor?

Accepted Answer

5.0 x 10^-8 J

Answer

2.5 x 10^-8 J

Answer

1.0 x 10^-7 J

Answer

2.0 x 10^-7 J

Question 11

Two point charges, +4q and -q, are separated by a distance d. Determine the point (in terms of d) along the line connecting the two charges where the electric potential is zero (excluding infinity).

Accepted Answer

d/5 from the -q charge

Question 12

A parallel-plate capacitor has a capacitance C. If the area of the plates is doubled and the distance between the plates is halved, what is the new capacitance?

Accepted Answer

4C

Answer

C/4

Answer

C/2

Answer

2C

Question 13

If the electric field is zero at a point, the electric potential must also be zero at that point.

Accepted Answer

True

Answer

False

Question 14

A conductor has a current of 3 A flowing through it. If 60 C of charge pass through a cross-sectional area of the conductor, how long did it take for this amount of charge to pass through?

Accepted Answer

20 seconds

Question 15

A wire with a cross-sectional area of $2 	imes 10^{-6} m^2$ carries a current of 4 A. What is the current density in the wire?

Accepted Answer

C. $2 	imes 10^{6} A/m^2$

Answer

A. $8 	imes 10^{-6} A/m^2$

Answer

B. $0.5 	imes 10^{-6} A/m^2$

Answer

D. $2 A/m^2$

Question 16

A 12 V battery is connected across a resistor. If the current flowing through the resistor is 0.5 A, what is the resistance of the resistor?

Accepted Answer

B. 24 Ω

Answer

A. 6 Ω

Answer

C. 12 Ω

Answer

D. 0.04 Ω

Question 17

Two resistors, $R_1 = 10 \Omega$ and $R_2 = 20 \Omega$, are connected in parallel. What is the equivalent resistance of the parallel combination?

Accepted Answer

A. 6.67 Ω

Answer

B. 30 Ω

Answer

C. 15 Ω

Answer

D. 0.15 Ω

Question 18

In a circuit, a junction has three wires connected to it. Wire 1 has a current of 2 A entering the junction, and wire 2 has a current of 3 A entering the junction. What is the current in wire 3, which is leaving the junction?

Accepted Answer

5 A

Question 19

In an RC circuit, a 10 μF capacitor is charged through a 1 kΩ resistor with a 10 V battery. What is the time constant of this circuit?

Accepted Answer

B. 0.01 s

Answer

A. 0.1 s

Answer

C. 10 s

Answer

D. 0.001 s

Question 20

A proton moves with a velocity of $2 	imes 10^6 m/s$ perpendicular to a magnetic field of 0.5 T. Calculate the magnitude of the magnetic force acting on the proton. (Charge of proton = $1.602 	imes 10^{-19} C$)

Accepted Answer

1.602e-13 N

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