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A thin semi-circular ring of radius r ha...

A thin semi-circular ring of radius r has a positive charge q distributed uniformly over it as shown in the figure. The net field `vec(E)` at the center O is

A

`(q)/(2pi^(2) epsilon_(0) r^(2)) hat(j)`

B

`(q)/(4pi^(2) epsilon_(0) r^(2)) hat(j)`

C

`-(q)/(2pi^(2) epsilon_(0) r^(2)) hat(j)`

D

`-(q)/(2pi^(2) epsilon_(0) r^(2)) hat(j)`

Text Solution

Verified by Experts

The correct Answer is:
D
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