5. A particle (mass = 6.7 ´ 10–27 kg, charge = 3.2 ´ 10–19 C) moves along the positive x axis with a speed of 4.8 ´ 105 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?
a. 2.0 kN/C b. 1.5 kN/C c. 1.2 kN/C
d. 3.5 kN/C e. 2.4 kN/C
7. If a = 30 cm, b = 20 cm, q = +2.0 nC, and Q = –3.0 nC in the figure, what is the potential difference ?
a. +60 V b. +72 V c. +84 V
d. +96 V e. +48 V
9. How many electrons pass through a 20-W resistor in 10 min if there is a potential drop of 30 volts across it?
a. 5.6 ´ 1021 b. 7.5 ´ 1021 c. 9.4 ´ 1021
d. 1.1 ´ 1021 e. 3.8 ´ 1021
11. A 2.0-C charge moves with a velocity of (2.0i + 4.0j + 6.0k) m/s and experiences a magnetic force of (4.0i – 20j + 12k) N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.
a. –3.0 T b. +3.0 T c. +5.0 T
d. –5.0 T e. +6.0 T
12. A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = (30i – 40j ) mT. What is the resulting magnetic force on the wire?
a. (+1.2 k) N b. (–1.2 k) N c. (–1.5 k) N
d. (+1.5 k) N e. (+0.90 k) N
13. What is the magnitude of the magnetic force on a charged particle (Q = 5.0 µC) moving with a speed of 80 km/s in the positive x direction at a point where Bx= 5.0 T, By= –4.0 T, and Bz= 3.0 T?
a. 2.8 N b. 1.6 N c. 1.2 N
d. 2.0 N e. 0.4 N
14. Determine the potential difference Va – Vb shown in the circuit below.
a. –5.0 V b. +5.0 V c. –10 V
d. +10 V e. 0 V
15. What is the equivalent resistance between points a and b when R = 30 W?
a. 27 W b. 21 W c. 24 W
d. 18 W e. 7.5 W
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