A current i ampere flows in a circular a...

A current `i` ampere flows in a circular arc of wire whose radius is `R`, which subtend an angle `3pi//2` radian at its centre. The magnetic induction `B` at the centre is

`(mu_(0)i)/R`

`(3m_(0)i)/(2R)`

`(3mu_(0)i)/(4R)`

`(3mu_(0)i)/(8R)`

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