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)`

`(mu_(0)I)/(2r)`

`(2 mu_(0)I)/(r)`

`(3 mu_(0)I)/(8 r)`

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