1-Two circular coils c1 and c2 each of 100 turns are held in such a way that c1 lies in vertical plane and the other c2 in the horizontal plane, with their centres coinciding. The radii of the coils are r1= 20cm and r2= 30cm the direction of currents I1 and I2 passed through the two coils are such that earth's magnetic field at the common centre is neutralized completely. If H= 27.8 Am^-1 and angle of dip is 30 degree . calculate the values of i1 and i2...