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.

Assertion: ${\chi }_{\mathrm{n}}-T$ graph for a diamagnetic material is a straight line parallel to $T$-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: $T=2\mathrm{\pi }\sqrt{\frac{I}{MH}}$, 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: ${\mu }_{\mathrm{r}}=\frac{\mu }{{\mu }_0}$, 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.