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A vertically ring of radius r and resist...

A vertically ring of radius `r` and resistance `R` falls vertically. It is in conect with two vertical rails which are joined at the top. The rails are without friction and resistance. There is a horizontal uniform magnetic field of magnitude `B` the speed of the ring is `v`, the current in the top horizontal of the rail section is

A

zero

B

`(2Brv)/(R)`

C

`(4Brv)/(R)`

D

`(8Brv)/(R)`

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