JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Assertion (A): Magnetic moment of helium atom is zero.

Reason (R): All the electron are paired in helium atom orbitals.

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Correct option: A

If both (A) and (R) are true and the (R) is a correct explanation of the (A)

Option A (If both (A) and (R) are true and the (R) is a correct explanation of the (A)) is correct because helium's zero magnetic moment is directly due to its paired electrons.

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Curie temperature is the one above which A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is The relative permeability of a substance

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\mu_{\mathrm{d}}, \mu_{\mathrm{p}}

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\mu_{\mathrm{f}}

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