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Three similar charges +q are placed on 3...

Three similar charges `+q` are placed on `3` corners of an equilateral triangle `ABC` of side `a`. How many minimum charges should be placed on a circle of radius `a` with centre at `A` so that resultant force on the charge placed at the centre is `(q^(2))/(4pi epsilon_(0)a^(2))` along `x`-axis,

A

4

B

6

C

3

D

Any number

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The correct Answer is:
C
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