7. A particle (g = +2.0 mC), moving in a region where only electric forces act o

Question

7. A particle (g = +2.0 mC), moving in a region where only electric forces act on it, has a kinetic energy of 5.0 J at point A. The particle subsequently passes through point B, which has an electric potential of +1.5 kV relative to point A. Determine the kinetic energy of the particle as it moves through point B. a) 3.0 J b) 2.0 J c) 5.0 J d) 8.0 J e) 10.0 J 8. The capacitance of a parallel -plate capacitor can be increased by: a) increasing the charge on each plate. b) decreasing the charge on each plate. C) increasing the plate separation. d) decreasing the plate separation. e) decreasing the plate area. 9. A certain parallel -plate capacitor has two plates of area 0.230 m^2 that are separated by a 0.102 -mm air gap. The charge on the capacitor is 4.0 mu C. What is the potential difference between the plates of this capacitor? a) 0 V b) 40 mV c) 100 V d) 200 V e) 400 V

Explanation / Answer

change in potential energy is q* deltaV

=2*10-3 * 1.5*103 = 3J

since potential increases we are moving opposite to electric field and hence KE decreases by 3J

final KE = 5-3 = 2J

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