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On meter length of wires carriers a cons...

On meter length of wires carriers a constant current. The wire is bent to from a circular loop. The magnetic field at the centre of this loop is `B`. The same is now bent to form a circular loop of smaller radius to have four turns in the loop. The magnetic field at the centre of this loop `B`. The same is now bent to form a circular loop of smaller radius of have four turns in the loop. The magnetic field at the centre of this new loop is

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