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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Let

\mathrm{m}

and

\mathrm{r}

are the dipole moment and radius of earth respectively. Then, the earth's magnetic field at the equator is

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Correct option: A

\frac{\mu_0}{4 \pi} \frac{\mathrm{m}}{\mathrm{r}^3}

Option A is correct because the magnetic field at the equator due to the Earth's dipole moment is given by the formula B = (

\mu_0

/4

\pi

) (m/r³).

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

\mu_{\mathrm{f}}

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