Consider the circular loop having curre...

Consider the circular loop having current I nad with central point O. the magnetic field at the central point O is

a.`(2mu_(0)i)/(3pi R)` acting downward

b. `(5mu_(0) i)/(12 R)` acting downward

c.`(6mu_(0)i)/(11 R)` acting downward

d.`(3mu_(0)i)/(7R)` acting downward

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