1)The time period of a dip needle vibrating in the vertical plane in the magnetic meridian is 3 seconds. When the same magnetic needle is made to vibrate in the horizontal plane, the time period of vibration is 3(2)^(1/2). What is the angle of dip of the place? I think in both the cases, it is the horizontal component of earth’s magnetic field that exerts a restoring couple on the dip needle and causes it to oscillate. But how to go further?Please give an idea on how to solve this problem.