EASY
JEE Advanced
IMPORTANT
Earn 100

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.

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Important Questions on Magnetism

EASY
JEE Advanced
IMPORTANT

Assertion: χn-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.

MEDIUM
JEE Advanced
IMPORTANT

Assertion: Time period of vibration of a pair of magnets in sum position is always smaller than in difference position.

Reason: T=2πIMH, where symbols have their standard meaning.

EASY
JEE Advanced
IMPORTANT

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.

EASY
JEE Advanced
IMPORTANT

Assertion: Steel is not attracted by a magnet

Reason: Steel is not a magnetic substance.

EASY
JEE Advanced
IMPORTANT

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.

EASY
JEE Advanced
IMPORTANT

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.

EASY
JEE Advanced
IMPORTANT

Assertion: Relative magnetic permeability has no units and no dimensions.

Reason: μr=μμ0, where the symbols have their standard meaning.

EASY
JEE Advanced
IMPORTANT

Assertion: The net magnetic flux coming out of a closed surface is always zero.

Reason: Unlike poles of equal strength exist together.