21 The magnetic needle of a vibration magneto meter makes 12

Last updated: 6/10/2023

21 The magnetic needle of a vibration magneto meter makes 12 oscillations per minute in the horizo ntal component of earth s magnetic field When an external short bar magnet is placed at some distance along the axis of the needle in the same line it makes 15 oscillations per minute If the poles of the bar magnet are inter changed the number of oscillations it takes per minute is 1 61 2 63 3 65 4 67