A circular arc of wire subtends an angle...

A circular arc of wire subtends an angle `pi` /2 at the centre. If it carries a current i and its radius of curvature is R then the magnetic field at the centre of the arc is

`(mu_(0)i)/R`

`(mu_(0)i)/(2R)`

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

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

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