4 - Electric Potential

# 4 - Electric Potential - Physics 8B 4 Electric Potential...

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Physics 8B 4 – Electric Potential rev 4.0 4 – Electric Potential 1. D-cell alkaline batteries (e.g. for your flashlight) provide a potential difference between its terminals of 1.5 V. a) P: How much charge can be moved through this potential difference if the D-cell contains 21,600 J of chemical energy? b) Q: AA-cell alkaline batteries (e.g. for your calculator) operate based on the same chemical reaction and thus they also produce a 1.5 V difference between the terminals. What then is the practical difference between a D- cell and an AA-cell battery? 2. Consider equipotential surfaces (constant voltage). A charge, q = +2 C, with mass, m = 500 g, is released from rest at 12V. a) P: What is the electric potential energy of the charge when released? b) Q: Which way will the charge move, toward higher potential energy or lower potential energy? Explain. c) Q: Which way will the charge move, toward higher potential or lower potential? Explain. d) P: What is its velocity when it reaches either the 4 V or 20 V surface? e) Q: Which direction does the electric field point on the 12V surface? f) Repeat a) – e) for q = -2 C. g) P: If q = +3 C is shot from the 12 V surface with initial velocity of 6 m/s to the right, at what voltage will it stop and turn around? q 4 V 8 V 12 V 16 V 20 V d

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Physics 8B 4 – Electric Potential rev 4.0 3. Consider the parallel plate arrangements shown below. All the plates have area A. a) Q: Rank the arrangements based on the strength of the electric field between the plates (strongest to weakest). Which way does the electric field point in each case? b)
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## This note was uploaded on 09/28/2009 for the course PHYSICS 8B taught by Professor Shapiro during the Spring '07 term at Berkeley.

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4 - Electric Potential - Physics 8B 4 Electric Potential...

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