MHT CET 2025 23rd April Morning Shift | Moving Charges and Magnetism Question 5 | Physics

The magnetic field at the centre of a current carrying circular coil of area ' $A$ ' is ' $B$ '. The magnetic moment ( M ) of the coil is ( $\mu_0=$ permeability of free space)

$\frac{\mathrm{BA}^2}{\mu_0 \pi}$

$\frac{2 B A^{3 / 2}}{\mu_0 \sqrt{\pi}}$

$\frac{B A^{3 / 2}}{\mu_0 \pi}$

$\frac{\mu_0 \sqrt{\pi}}{\mathrm{BA}^{3 / 2}}$

MHT CET 2025 23rd April Morning Shift

MCQ (Single Correct Answer)

-0

Let the current ' $I$ ' be associated with an electron of charge ' $e$ ' moving in a circular orbit of radius ' $r$ ' with speed ' $v$ ' around the positively charged nucleus. The ratio $\frac{r}{v}$ is

$\frac{\mathrm{eI}}{2 \pi}$

$\frac{2 \pi}{\mathrm{eI}}$

$\frac{\mathrm{e}}{2 \pi \mathrm{I}}$

$\frac{2 e \mathrm{I}}{\pi}$

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

A particle of charge $q$ moves with a velocity $\overrightarrow{\mathrm{V}}=a \hat{\mathrm{i}}$ in a magnetic field $\overrightarrow{\mathrm{B}}=b \hat{\mathrm{j}}+c \hat{\mathrm{k}}$, where ' $a$ ', ' b ' and ' c ' are constants. The magnitude of force experienced by particle is

$q a \sqrt{b^2+c^2}$

$\mathrm{qa}(\mathrm{b}+\mathrm{c})$

$q a \sqrt{b^2-c^2}$

zero

MHT CET 2025 22nd April Evening Shift

MCQ (Single Correct Answer)

-0

Two similar wires of equal lengths are bent in the form of a square and a circular loop. They are suspended in a uniform magnetic field and same current is passed through them. Torque experienced by

circular loop is greater.

square loop is greater.

both loops is same.

both will be zero.

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