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Question

Two point charges q and 4q are separated by a distance of 1m in air. At what distance from the charge +q is the electric field intensity zero?

A
14m
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B
13m
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C
23m
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D
34m
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Solution

The correct option is A 13m
(k)(q)(1)r2=(k)(4q)(1)(1r)2
(1r)2r2=4
1rr=2 1r=2r
3r=1
r=1/3
so, 13m

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