Two concentric coils each of radius equal to 2\[mg(h-d)-\frac{1}{2}k{{d}^{2}}\] cm are placed at right angles to each other. 3 A and 4 A are the currents flowing in each coil respectively. The magnetic induction in \[Wb/{{m}^{2}}\] at the centre of the coils will be \[({{\mu }_{0}}=4\pi \,\times {{10}^{-7}}\,Wb/Am)\]