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Question

Point charges q,q,2Q and Q are placed in order at the corners A,B,C,D of a square of side 2b. If the field at the midpoint CD is zero, then qQ is:

A
1
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B
2
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C
225
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D
552
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Solution

The correct option is C 552

Point charges q, q, 2Q and Q are placed in order to the corners. Here, four point charges +q, 2Q, q, Q are given along with diagonal side.
(2b)2+(2b)2
=4b2+4b2
=8b2
=b4×2
=2b2
Now, the electric field at the intersection point of the diagonals of the square. Hence, the net electric field.
E=K(q+2Qq+Qr2)
=3Qr2K
=9×109×3×Q2b2
=552

1238664_1170319_ans_4a1c6519c49e41ff9bc3aa2d9d12a8fc.jpg

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