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Two ppoint chargres (+Q) and the (-2Q) a...

Two ppoint chargres `(+Q)` and the `(-2Q)` are fixed on the X-axis at positions a and 2a from origin respectively. At what positions on the axis, the electric field is zero

A

only `x = sqrt2 a`

B

only `x = - sqrt2a`

C

Both `x = +- sqrt2a`

D

only `x = (3a)/(2)`

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The correct Answer is:
B
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