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A circular arc of wire of radius of curv...

A circular arc of wire of radius of curvature r subtends an angle of p/4 radian at its centre. If i current is flowing in it then the magnetic induction at its centre is -

A

`(mu_(0)i)/(8r)`

B

`(mu_(0)i)/(4r)`

C

`(mu_(0) i)/(16 r)`

D

`0`

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