Question
Using a bar magnet P, a vibration magnetometer has time period 2seconds. When a bar Q (identical to P in mass and size) is placed on top of P, the time period is unchanged. Which of the following statements is true(a) Q is of non-magnetic material(b) Q is a bar magnet identical to P, and its north pole placed on top of P's north pole(c) Q is of unmagnetized ferromagnetic material(d) Nothing can be said about Q's properties
