Figure shows a square loop ABCD with edge length a. The resistance of the wire ABC is r and that of ADC is 2r. The value of magnetic field at the centre of the loop assuming uniform wire is
A
◉ ◉
B
C
◉ ◉
D
Text Solution
Verified by ExpertsThe correct answer is:
B
According to question resistance of wire 
is twice that of wire 
. Hence current flows through 
is half that of 
i.e. 
.
Also 
Magnetic field at center 
due to wire 
and 
(parts 1 and 2) 
and magnetic field at centre 
due to wires 
and 
(i.e. parts 3 and 4) 
Also 
. So 
Hence net magnetic field at center 
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