In the circuit shown below, a current 3 I enters at A. The semicircular parts ABC and ADC have equal radii 'r' but resistances 2R and R respectively. The magnetic field at the center of the circular loop ABCD is _________.
Fill in the blank with the correct answer from the options given below
1
\(\rm \frac{\mu_0I}{4r}\) out of the plane
2
\(\rm \frac{\mu_0I}{4r}\) into the plane
3
\(\rm \frac{\mu_03I}{4r}\) out of the plane
4
\(\rm \frac{\mu_03I}{4r}\) into the plane