In Fig. 29-60, two concentric circular loops of wire carrying current in the same direction lie ...

In Fig. 29-60, two concentric circular loops of wire carrying current in the same direction lie in the same plane. Loop 1 has radius \( 1.50 \mathrm{~cm} \) and carries \( 4.00 \mathrm{~mA} \). Loop 2 has radius
\( 2.50 \mathrm{~cm} \) and carries \( 6.00 \mathrm{~mA} \). Loop 2 is to be rotated about a diameter while the net magnetic field \( \vec{B} \) set up by the two loops at their common center is measured. Through what angle must loop 2 be rotated so that the magnitude of that net field is \( 100 \mathrm{nT} \) ?

[jonathancalabrese]

Thank you so much for making this! Saved me so much of a headache.