Four identical charges each of 1μC are placed at the corners of a square of side 10 cm. The resultant field strength at the centre is :
A
9×109V/m
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B
3.6×105V/m
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C
18×105V/m
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D
Zero
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Solution
The correct option is D Zero → The effective electric field is zero as the electric field by any charge is cancelled by the diagonally opposite charge. → E is a vector quantity