A cell is connected between two points of a uniformly thick circular conductor. The magnetic field at the center of the loop will be (Here 
and 
are the currents flowing in the two parts of the circular conductor of radius ‘a’ and 
has the usual meaning)
Text Solution
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Direction of currents in two parts is different, so direction of magnetic fields due to these currents is opposite. Also applying Ohm's law across 
Hence, two field induction's are equal but of opposite direction. So, resultant magnetic induction at the center is zero and is independent of 
.
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