(a) Can two equipotential surfaces intersect each other? Give reasons. (b) Two charges \( -q \) ...

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(a) Can two equipotential surfaces intersect each other? Give reasons. (b) Two charges \( -q \) and \( +q \) are located at points \( A(0 \), \( 0,-a) \) and \( B(0,0,+a) \), respectively. How much work is done in moving a test charge from point \( P(7,0,0) \) to point \( Q(-3,0,0) \) ?
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