Two opposite point charges of same magnitude separated by distance 2d, electric potential midway between them is?
Answer: Zero
Explanation
Let the two charges be:
-
+q at one end
-
−q at the other end
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Distance between them = 2d
-
Midpoint = distance d from both charges
The electric potential at a point due to a charge:
V= kq/r
So, at the midpoint:
-
Potential due to +q: +kq/ d
-
Potential due to −q: −kq/d
Vnet=kq/d−kq/d=0
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