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Two concentric rings, one of radius R an...

Two concentric rings, one of radius `R` and total charge `+Q` and second of radius `2R` and total charge `-sqrt(8)Q`, lie in `x-y` plane (i.e., `z=0`plane). The common centre of rings lies at origin and the common axis coincides with `z`-axis. The charge is uniformly distributed on both rings.
At what distance from origin is the net electric field on `z`-axis zero?

A

`(R )/(2)`

B

`(R )/(sqrt(2))`

C

`(R )/(sqrt(2))`

D

`(R )/(2sqrt(2))`

Text Solution

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The correct Answer is:
D
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