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The field at the centre of a loop of radius R due to the current of I ampere in the loop as shown in Fig. will be :

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zero

$\frac{μ_{0}}{4 π} \frac{2 πI}{R}$

$\frac{μ_{0}}{4 π} \frac{2 I}{R} [π - 1]$

$\frac{μ_{0}}{4 π} \frac{2 I}{R}$

answer is A.

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Detailed Solution

Magnetic field due to straight current wires is zero. While the magnetic field due to circular arcs cancel each other giving us zero magnetic field

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