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Question

Two electric charges of +109C and 109C are placed at the corners A and B of an equilateral triangle ABC side 5cm.The electric intensity at C is


A
1800N/C
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B
3600N/C
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C
900N/C
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D
2700N/C
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Solution

The correct option is B 3600N/C
Net E in y direction gets cancelled
Field in x direction is given by:
Ex=(k×109(5×102)2×cos 600)×2

=9×109×10925×104×12×2

Ex=3600 N/C

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