Magnetism and M...

The vertical component of earth’s magnetic field is zero at

A dip needle which is free to move in a vertical plane perpendicular to magnetic meridian will remain

The arms of a deflection magnetometer in the tangent B position are placed along

A dip needle arranged to move freely in the magnetic meridian dips by an angle θ. If the vertical plane in which the needle moves is rotated through an angle α to the magnetic meridian, then the needle will dip by an angle

The period of oscillation of a magnet in a vibration magnetometer is 2 seconds. The period of oscillation of a magnet whose magnetic moment is sixteen times that of the first magnet is

Two short magnets have equal pole strengths but one is twice as long as the other. The shorter magnet is placed 20 cm in tan A position from the compass needle. The longer magnet must be placed on the other side of the magnetometer for no deflection at a distance equal to

The magnetic needle of an oscillation magnetometer makes 10 oscillations per minute under the action of earth’s magnetic field alone. When a bar magnet is placed at some distance along the axis of the needle, it makes 14 oscillations per minute. If the bar magnet is turned so that its poles interchange their positions, then the new frequency of oscillation of the needle is

A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 second. The same needle is then allowed to vibrate in the horizontal plane, and the time period is again found to be 2 second. Then the angle of dip is

A magnetic needle suspended horizontally by an unspun silk fibre oscillates in the horizontal plane, because of the restoring force originating mainly from