Quiz2-1Bb_w_solns

# Quiz2-1Bb_w_solns - charger? (a) 2 . 16 10 4 J (b) 2 . 16...

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Department of Physics, UCSD Winter 2009 – Physics 1B(b) Prof. Dimitri Basov Quiz 2, January 30 (Version A) 1. Find the equivalent capacitance between points a and b in the combination of capacitors in the diagram. (a) 1 . 5 μ F (b) 5 . 3 μ F (c) 12 . 9 μ F (d) 14 . 4 μ F (e) 22 . 0 μ F 2. Find the potential at point P for the rectangular grouping of charges shown in the diagram. (a) 4 . 22 × 10 5 V (b) 8 . 34 × 10 5 V (c) 1 . 88 × 10 6 V (d) 3 . 05 × 10 6 V (e) Zero 3. A parallel plate capacitor has 2 . 00 cm 2 plates that are separated by 5.00 mm with air between them. If a 12 V battery is connected to this capacitor, how much energy does it store? ( ± 0 =8 . 85 × 10 - 12 F / m.) (a) 2 . 55 × 10 - 9 J (b) 2 . 55 × 10 - 11 J (c) 2 . 55 × 10 - 13 J (d) 2 . 55 × 10 - 15 J (e) 2 . 55 × 10 - 17 J 1

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4. In order to recharge a 12 V battery, a battery charger must move 3 . 6 × 10 5 C of charge from the negative terminal to the positive terminal. How much work is done by the battery

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Unformatted text preview: charger? (a) 2 . 16 10 4 J (b) 2 . 16 10 5 J (c) 2 . 16 10 6 J (d) 4 . 32 10 5 J (e) 4 . 32 10 6 J 5. A 4.00-kg block carrying a charge of Q = 50 . C is connected to a spring for which k = 100 N / m. The block lies on a frictionless horizontal track and the sys-tem is immersed in a uniform electric Feld of magni-tude E = 5 . 00 10 5 V / m directed as in the diagram. If the block is released at rest when the spring is un-stretched at x = 0, by what maximum amount does the spring expand? (a) 0 . 25 m (b) 0 . 50 m (c) 0 . 75 m (d) 1 . 00 m (e) 1 . 25 m Good luck! 2...
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## This note was uploaded on 03/21/2009 for the course PHYS PHYS 1B taught by Professor Berman during the Winter '09 term at UCSD.

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Quiz2-1Bb_w_solns - charger? (a) 2 . 16 10 4 J (b) 2 . 16...

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