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A uniform current carrying ring of mass `m` and radius `R` is connected by a massless string as shown in Fig. 1.142. A uniform magnetic field `B_0` exists in the region to keep the ring in horizontal position, then the current in the ring is (l=length of string)
.

A

`(mg)/(piRB_(0))`

B

`(mg)/(RB_(0))`

C

`(mg)/(3piRB_(0))`

D

`(mgl)/(piR^(2)B_(0))`

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The correct Answer is:
D
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