General physies II, exam1 Version 1B 5. [161 Four point charges are on the rim o
ID: 1878241 • Letter: G
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General physies II, exam1 Version 1B 5. [161 Four point charges are on the rim of drele of radius 10 em. The darem are +030 pC, +1.5 pc, -1.0 IC, and -0.50 pC. If the electrical potential at the circle's center due to the +-0.50 pC charge alone is 4.5 x 10 V, what is the total potential at the center due to the four charges comblinedt a. 18 x 104 v b. 4.5x 10*v e. zero d. -4.5 x 104V 6. (15/4) Eleetrons in a particle beam each have a kinetie energy of 3.60 x 10-17J. What is the magnitude of the electric field that will stop these electrons in a distance of 0.100 m? a. 576 N/c b. c. d. 4440 N/C e. 16900N/C 2250 N/C 22 500 N/C 7. [1516) A ping-pong ball covered with a conducting graphite coating has a mass of 5.8 x 10-3 kg and a charge of 4 pC. What electric field directed upward will exactly balance the weight of the ball? a. 0.7x 10 N/C b. 1.4×104 N/C d. 2.4 x 10 N/C e. 6.8 x 10 N/C 8. [171] The quantity volt is equivalent to which of the following? a. Jm b. JC d. J/C 9. [1512] Charge A has 10 electric field lines coming out, Charge B has 20 lines coming out, and Ch has 30 lines coming in. Which pair of these charges will have the largest force between them if one centimeter apart? a. A and E b. B and C c. C and A d. More information is needed. 10. (22160) When a car is struck by lightning, the resulting electric field inside the car is a. normally huge, but for a brief time. b. small enough to be safe for a passenger inside. c. zero.Explanation / Answer
5) Option B)
The potential at the circle’s center is due to the net potential of all the charges. But the additional charges total to zero; hence V is due only to the +0.5µC charge! Thus V = 45 kV
6) Option B)
work done by E = Fx
=====> KE qEx =====> KE E = KE/ex
So E = 3.6×1017J/(1.6×1019C×0.1m) = 2250 N/C
7) Option B)
For balance in the E-field, qE = mg E = mg/q
E = [5.8×103kg×9.8m/s2]/4×106C = 1.42×104 N/C, upward.
8) Option D)
9) Option B)
10) Option B)
small enough to be safe for a passenger inside.
Death or serious injury by lightning strike for someone completely contained within a car is extremely rare. Yes the conducting car body acts as a Faraday cage, but not a perfect one. It reduces, but does not eliminate, the electric field inside. A car whose body is mostly fiberglass or plastic thus offers less protection
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