Physics Quest Assignment ^

Satisfactory Essays
Topics: Electric charge
chen (azc96) – Assignment 6 - Electricity – schultz – (WVSPR2011APB01)
This print-out should have 20 questions.
Multiple-choice questions may continue on the next column or page – find all choices before answering.
001 (part 1 of 2) 10.0 points
An object with a charge 3 C and a mass
0.4 kg accelerates from rest to a speed of
19 m/s.
Calculate the kinetic energy gained.
Answer in units of J.
002 (part 2 of 2) 10.0 points
Through how large a potential difference did the object fall?
Answer in units of V.
003 (part 1 of 2) 10.0 points
Consider three charges arranged as shown.
7 µC

1.8 µC

+

+
4 cm

−1 µC


2.4 cm

What is the magnitude of the electric field strength at a point 1.7 cm to the left of the middle charge? The value of the Coulomb constant is 8.98755 × 109 N · m2 /C2 .
Answer in units of N/C.
004 (part 2 of 2) 10.0 points
What is the magnitude of the force on a −1 µC charge placed at this point?
Answer in units of N.
005 10.0 points
Would you feel any electrical effects if you were inside the charged sphere of a van de
Graaff generator? Why or why not?
1. None of these
2. Yes; the electric field exists both inside and outside of the generator.
3. More information is needed.

1

4. Yes; the electric field is very strong inside the van de Graff generator.
5. No; although there are charges inside the generator, the net charge is zero.
6. No; the inside of the generator has zero charge and thus no electric field.
006 10.0 points
How many 105 W lightbulbs can you use in a
110 V circuit without tripping a 15 A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbulb is 110 V.)
Answer in units of bulbs.
007 (part 1 of 3) 10.0 points
The energy (in Joules) stored in a capacitor with capacitance C (in Farads), having a potential difference V (in volts), is given
1
by W = C V 2 . One application is in the
2
electronic photoflash or strobe light.

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