In Fig. 25-3, the potential difference between the metal plates in air is 40 V. (a) Which

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In Fig. 25-3, the potential difference between the metal plates in air is 40 V. 

(a) Which plate is at the higher potential? 

(b) How much work must be done to carry a +3.0 C charge from B to A? From A to B? 

(c) How do we know that the electric field is in the direction indicated? 

(d) If the plate separation is 5.0 mm, what is the magnitude of E?A + + + + + E d Fig. 25-3 B

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