JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Assertion (A): Magnetic poles are only mathematical assumptions having no real existence.

Reason (R): A charged particle is moved along a magnetic field line. The magnetic force on the particle is perpendicular to its velocity.

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Correct option: C

If (A) is true but the (R) is false

Option C (If (A) is true but the (R) is false) is correct because magnetic poles are mathematical constructs, but the force on a charged particle moving along a magnetic field line is zero, not perpendicular.

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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}}

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

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\mu_{\mathrm{f}}

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