TS EAMCET 4 May 2018 Shift 1 Solved Paper

Two circular loops L1 and L2 of wire carrying equal and opposite currents are placed parallel to each other with a common axis. The radius of loop L1 is R1 and that of L2 is R2. The distance between the centres of the loops is √3R1. The magnetic field at the centre of L2 shall be zero if