A straight wire of length 
meter is carrying a current of 2A and the magnetic field due to it is measured at a point distant 1 cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be
Text Solution
Verified by ExpertsThe correct answer is:
B
If a wire of length l is bent in the form of a circle of radius r then 
⇒ ⇒ 
Magnetic field due to straight wire
also magnetic field due to circular loop
⇒ ⇒ 
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