UPSEE Solved Model Paper 8

An infinitely long conductor PQR is bent to form a right angle as shown in figure. A current I flows through PQR . The magnetic field due to this current at the point M is H1 Now, another infinitely long straight conductor QS is connected at Q , so that current is 1/2 in QR as well as in QS. The current in PQ remaining unchanged. The magnetic field at M is now H2 . The ratio H1 is given by