A current of \( 10 \mathrm{~A} \) is passing through a long wire which has semicircular loop of ...

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A current of \( 10 \mathrm{~A} \) is passing through a long wire which has semicircular loop of the radius \( 20 \mathrm{~cm} \) as shown in the figure. Magnetic field produced at the centre of the loop is:
(A) \( 4 \pi \mu T \)
(B) \( 2 \pi \mu \mathrm{T} \)
(C) \( 10 \pi \mu T \)
(D) \( 5 \pi \mu \mathrm{T} \)
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