phy202_lect21

# If r 40 k c 30 mf 15 v q 12 mc and i 20 ma

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Unformatted text preview: *** ******* ********* ** * _ ___ 1. If R = 4.0 kΩ, C = 3.0 mF, ε = 15 V, Q = 12 mC, and I = 2.0 mA, what is the potential difference Vb − Va? Some Difficult Problems a. b. c. d. e. +3.0 V −19 V −3.0 V +27 V +21 V ____ 2. How many time constants must elapse if an initially charged capacitor is to discharge to 45% of its stored energy through a resistor? a. 0.60 b. 0.46 c. 0.52 d. 0.40 e. 1.1 ____ 3. If R1 = 3.0 Ω, R2 = 6.0 Ω, R3 = 12 Ω, and I = 0.50 A, at what rate is heat being generated in R1 ? ____ 7. A battery has an internal resistance of 4.0 Ω. Which of the following load resistors would have the most power delivered to it when connected across the battery? a. 1.4 Ω b. 2.0 Ω c. 4.0 Ω d. 8.0 Ω e. 16 Ω ____ 8. A deuteron is accelerated from rest through a 10-kV potential difference and then moves perpendicularly a. 20 W to a uniform magnetic field with B = 1.6 T. What is the radius of the resulting circular path? (deuteron: b. 17 W m = 3.3 × 10−2 7 kg, q = 1.6 × 10−1 9 C) c. 12 W a. 19 mm d. 31 W b. 13 mm e. 6.0 W c. 20 mm ____ 17. ____ 15. ____ 18. ____ 16. a. 200 µT b. 600 µT c. 450 µT d. 300 µT e. 400 µT On the average, in a ferromagnetic domain permanent atomic magnetic moments are aligned ____ to one another. Two long parallel wires are separated by 6.0 mm. The current in one of the wires is twice the other a. antiparallel c parallel b. urrent. If the magnitude of the force on a 3.0-m length of one of the wires is equal to 8.0 µN, what is t greater of the c.he perpendicular two currents? a. 0.20 A d. alternately parallel and antiparallel b. 0.40 A e. randomly relative c. 40 mA Td. c20 mAloops are coaxial and coplanar. One has radius a and the other has radius 2 a. Current 2 I in wo urrent the outer loop is parallel to current I in the inner loop. The magnitude of the magnetic field at the center e. 0.63 A of the two loops is a. wo solenoids are each made of 2 000 turns of copper wire per meter. Solenoid I is 2 m long, while T 0. µ0 I solenoid II is 1 m long. When eq...
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## This note was uploaded on 02/25/2014 for the course PHYSICS 202 taught by Professor Pan during the Fall '11 term at University of Wisconsin.

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