ch24_p89 - 89. (a) The charges are equal and are the same...

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89. (a) The charges are equal and are the same distance from C . We use the Pythagorean theorem to find the distance rd d d =+ = 22 2 b g b g . The electric potential at C is the sum of the potential due to the individual charges but since they produce the same potential, it is twice that of either one: () 92 2 6 6 8.99 10 N m C 2 2 2.0 10 C 2.5 10 V. 4 4 0.020 m q q V dd εε ×⋅ × == = = × 00 ππ (b) As you move the charge into position from far away the potential energy changes from zero to qV , where V is the electric potential at the final location of the charge. The change in the potential energy equals the work you must do to bring the charge in:
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