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Question

Point charges of 3×109C are situated at each of the three corners of a square whose side is 15cm. The magnitude and direction of electric field at the vacant corner of the square is :


A
2294V/m along the diagonal
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B
9622 V/m along the diagonal
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C
22.0V/m along the diagonal
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D
zero
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Solution

The correct option is A 2294V/m along the diagonal
Effective electric field will be 2E1+E2 along the diagonal.
E=kq1(15×102)22+kq1(2×15×102)2

=9×109×3×109×2225×104+9×109×3×1092×225×104

=38.1225×104+13.5225×104
=51.6225×104
E=2293.33 V/m
=2294 V/m

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