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# Test 2 - Physics 116 B Sec 2(Prof Csorna TEST#2 Formulas...

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Physics 116 B Sec 2 (Prof. Csorna) 9/30/05 TEST #2 Formulas and Constants:

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1. An electron moves from point i to point f, in the direction of a uniform electric field. During this placement: A) the work done by the field is positive and the potential energy of the electron-field system increases B) the work done by the field is negative and the potential energy of the electron- field system increases C) the work done by the field is positive and the potential energy of the electron-field system decreases D) the work done by the field is negative and the potential energy of the electron- field system decreases E) the work done by the field is positive and the potential energy of the electron-field system does not change Ans: B 3. A particle with a charge of 5.5 × 10 –8 C is fixed at the origin. A particle with a charge of– 2.3 × 10 –8 C is moved from x = 3.5 cm on the x axis to y = 4.3 cm on the y axis. The change in potential energy of the two-particle system is: A) 3.1 × 10 –3 J B) –3.1 × 10 –3 J C) 6.0 × 10 –5 J D) –6.0 × 10 –5 J E) 0 Ans: C 10. During a lightning discharge, 30 C of charge move through a potential difference of 1.0 × 10 8 V in 2.0 × 10 –2 s. The energy released by this lightning bolt is:
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