JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Which of the following is responsible for the earth's magnetic field?

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Correct option: A

Convective currents in earth's core.

Option A (Convective currents in earth's core) is correct because the Earth's magnetic field is generated by the movement of molten iron in the Earth's outer core, which creates electric currents and thus a magnetic field.

More Questions from MAGNETISM AND MATTER

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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

X

is slightly less than unity and that of substance

Y

is slightly more than unity, then A bar magnet is equivalent to If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by

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

and

\mu_{\mathrm{f}}

respectively, then :- Which of the following is most suitable for the core of electromagnets