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Consider the loop PQRSP, carrying clockw...

Consider the loop PQRSP, carrying clockwise current i, shown in the figure. The magnitude of magnetic field at the centre O of the curved portion is

A

`(mu_(0)i)/(2pir)[pi-phi+tan phi]`

B

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

C

0

D

`(mu_(0)i)/(2pir)[pi-phi+tanphi]`

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