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