Question

The figure shows a thin plastic rod of length L = 10.3 cm and uniform positive charge Q = 52.7 fC lying on an x axis

The figure shows a thin plastic rod of length L = 10.3 cm and uniform positive charge Q = 52.7 fC lying on an x axis. With V = 0 at infinity, find the electric potential at point P1 on the axis, at distance d = 3.07 cm from one end of the rod.

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Answer #1

Potential, V = [(Q/L)/4 pi e0] ln((d + L)/d)

V = [(9 x 10^9)(52.7 x 10^-15/0.103)] ln((0.0307 + 0.103)/0.0307)

V = 6.78 x 10^-3 V

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