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Q1. Two point charges are on the y-axis, one of magnitude 3.0 x10-9C at the origin and the second of magnitude 6.0 x10-9.C at the point y = 30cm. calculate the potential at y = 60 cm.

Q2. A copper telephone wire has essentially no sag between poles 20.5 meters apart on a winter day while the temperature is -15.5° C. How much longer is the wire on the summer day when the temperature is 27.0° C?

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