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Question:

A charge Q is placed at each of the opposite corners of a square. A charge q is placed at each of the other two corners. If the net electrical force on Q is zero, then Q/q equals:

√2

√2.

1

1

Solution:

Resultant on Q becomes zero only when q charges are of negative nature
KQ2/a² = √2Kq/a²
|Q/q| = 2√2
So, Q/q = √2