Calculate the potential energy of a charge +6nC placed at 0.07m from a charge +76 x10-6C. If the same charge(+6nC) is now at 0.07m from a charge -88 x10-6C, find its new potential energy.
Now we know that
Potential energy
U=kq1q2rU=\frac{kq_1 q_2}{r}U=rkq1q2
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