Reference no: EM13339988

1) A metal sphere of radius 10 cm carries a charge of +2.0 ?C. What is the magnitude of the electric field 5.0 cm outside the sphere's surface?
A) 4.0 × 105 N/C
B) 8.0 × 107 N/C
C) 8.0 × 105 N/C
D) 4.2 × 106 N/C
E) 4.0 × 107 N/C

2) When a current I1 = 1.3 A passes through a wire of cross-sectional area A1 = 5 mm2 the drift velocity of the charge carriers is v1 = 2.7 × 10-5 m/s. What is the drift velocity of the charges when a current I2 = 0.5 A passes through a wire, made of the same material of cross-sectional area A2 = 3 mm2?
A) 1.7 × 10-5 m/s
B) 3.2 × 10-5 m/s
C) 6.4 × 10-5 m/s
D) 2.1 × 10-5 m/s
E) 8.4 × 10-5 m/s

3) A parallel-plate capacitor has plates of area 0.80 m2 separated by a distance of 3.0 mm. What is this capacitor's capacitance?
A) 4.8 × 10-10 F
B) 270 F
C) 6.0 × 10-9 F
D) 3.6 × 10-10 F
E) 70 F

4) If two uncharged objects are rubbed together and one of them acquires a positive charge then the other one
A) also acquires a positive charge.
B) may or may not acquire a negative charge.
C) may or may not acquire a positive charge.
D) remains the same.
E) acquires a negative charge.

5) An RC circuit is connected across a DC voltage source through an open switch. The switch is closed at t = 0 s. Which of the following is a correct statement regarding the circuit?
A) Once the capacitor is fully charged, there is no current in the circuit.
B) The capacitor charges to its maximum value in one time constant.
C) The capacitor charges to its maximum value in two time constants.
D) The current flows through the circuit even after the capacitor is fully charged.
E) The resistor and the capacitor share the applied voltage equally as a function of time.

6) An advantage in evaluating surface integrals related to Gauss's law for symmetric charge distributions is
A) the charge is always on the surface.
B) the flux is inward.
C) the electric field is a constant on any surface.
D) the flux is outward.
E) the electric field is of constant magnitude on certain surfaces.