Question

Two identical charges q = (1/9.0) × 10−9 C are shown in the figure below. Find...

Two identical charges q = (1/9.0) × 10−9 C are shown in the figure below. Find the potential at P.

(Take r = 1.39 m and θ = 44°.)

18-p-006-alt.gif

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Answer #1

Electric potential ( V ) due to a charge Q at a distance r is given by:

kQ V =

where k = 9*109 Nm2/C2

Also electric potential is a scalar quantity and can be algebraically added irrespective of the angles.

So, at point P

  kq V

  2kq V =

  2 9 10 10 V 9 1.39

V = 1.439 volt

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