A magnet, freely suspended in a vibration magnetometer makes 40 oscillations per minute at a place A and 20 oscillations per minute at B.If BH at B is 36×10−6 T, then its value at A is :
A frequency of 1Hz corresponds to:
Two bar magnets are placed in a Vibration Magnetometer and allowed to vibrate. They make 20 oscillations per minute when their similar poles are on the same side and they make 15 oscillations per minute with their opposite poles lie on the same side. The ratio of their moments is :
In an experiment to find the speed of waves in a rope, a standing wave pattern is established as shown in diagram below. The vibrating end of rope makes 90 vibrations per minute. The speed of the waves is