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
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.
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.
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
by W = C V 2 . One application is in the
electronic photoﬂash or strobe light.