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Consider a point charge +q placed at the origin and another point charge -2p placed at a distance of 9 m from the charge +q . Determine the point between the two charges at which electric potential is zero. |
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Answer» Solution :According to the superposition PRINCIPLE the total electric potential at a point is equal to the sum of the potentials DUE to each charge at that point. Consider at a distance x from the charge +Q as shown in the figure The toatal electric potential at P is zero.  `V_("tot")=(1)/(4piepsilon_(0))((q)/(x)-(2q)/((9-x)))=0` which gives `(q)/(x) =(2q)/((9-x))` or `(1)/(x)=(2)/((9-x))` Hence x =3 n |
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