A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
The correct answer is (C) 4B.
Magnetic induction at the center of a circular coil with n turns is given by
B′ = n² B. For two turns (n=2), the magnetic induction becomes B′ = 2²B = 4B, quadrupling the original value.
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