A length 
of wire carries a steady current 
. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give three loops of smaller radius. The magnetic field at the centre caused by the same current is
Text Solution
Verified by ExpertsThe correct answer is:
D
The magnetic field at the center of a circular coil is
Where 
length of wire and n is number of turns. It is given that 
So 
at centre 
at center 
So 
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