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The magnetic field at centre, P will be

AIPMT 2000 Physics - Moving Charges and Magnetism Question 27 English
A
$${{{\mu _0}} \over {4\pi }}$$
B
$${{{\mu _0}} \over {\pi }}$$
C
$${{{\mu _0}} \over {2\pi }}$$
D
$$4{\mu _0}\pi $$
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