
Assertion: At neutral point, a compass needle may point out in any arbitrary direction.
Reason: Magnetic field of the earth is balanced by field due to magnet at the neutral point.


Important Questions on Magnetism
Assertion: graph for a diamagnetic material is a straight line parallel to -axis.
Reason: This is because the susceptibility of a diamagnetic material is not affected by temperature.

Assertion: Time period of vibration of a pair of magnets in sum position is always smaller than in difference position.
Reason: , where symbols have their standard meaning.

Assertion: Magnetism is relativistic.
Reason: When we move along with the charge, so that there is no motion relative to us, we find no magnetic field associated with the charge.

Assertion: Steel is not attracted by a magnet
Reason: Steel is not a magnetic substance.

Assertion: When the radius of a circular wire carrying current is doubled, its magnetic moment becomes four times.
Reason: Magnetic moment is directly proportional to the area of the loop.

Assertion: It is not necessary that every magnet has one North pole and one South pole.
Reason: It is a basic fact that magnetic poles occur in pairs.

Assertion: Relative magnetic permeability has no units and no dimensions.
Reason: , where the symbols have their standard meaning.

Assertion: The net magnetic flux coming out of a closed surface is always zero.
Reason: Unlike poles of equal strength exist together.
