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A closely packed coil having 1000 turns has an average radius of 62.8 cm. If the current carried by the wire of the coil is 1 A, the value of magnetic field produced at the centre of the coil will be (permeability of free space $=4\pi\times10^{-7}$ H/m) nearly:
Detailed Solution
$B=\frac{\mu_0 NI}{2R}=\frac{4\pi\times10^{-7}\times1000\times1}{2\times62.8\times10^{-2}}=10^{-3}$ T.