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A ring of diameter d is rotated in a uni...

A ring of diameter d is rotated in a uniform electric field until the position of maximum electric flux is found. The flux is found to be `phi`. What is the electric field strength?

A

`(4 phi)/(pi d^(2))`

B

`(2 phi)/(pi d^(2))`

C

`(phi)/(pi d^(2))`

D

`(pi phi d^(2))/(4)`

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