MHT CET 2025 23rd April Evening Shift | Moving Charges and Magnetism Question 1 | Physics

In hydrogen atom, an electron of charge 'e' revolves in an orbit of radius ' $r$ ' with speed ' $v$ '. The magnetic moment associated with electron is

$\frac{\mathrm{evr}}{3}$

$\frac{\mathrm{evr}}{2}$

evr

$\sqrt{2} \mathrm{evr}$

MHT CET 2025 23rd April Evening Shift

MCQ (Single Correct Answer)

-0

Two current carrying identical coils are kept as shown in figure. The magnetic field at centre ' O ' is ( N and R represent the number of turns and radius of each coil respectively, $\mu_0=$ permeability of free space)

MHT CET 2025 23rd April Evening Shift Physics - Moving Charges and Magnetism Question 1 English

$\frac{\mu_0 \mathrm{NI}}{2 R}$

$\frac{\mu_0 N I}{\sqrt{2} R}$

$\frac{\mu_0 N I}{2 \sqrt{2} R}$

$\frac{\mu_0 \mathrm{~N}}{2}$

MHT CET 2025 23rd April Evening Shift

MCQ (Single Correct Answer)

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The relation between magnetic moment $(\mathrm{M})$ of a current carrying circular coil and length (L) of the wire used is

$\mathrm{M} \propto \mathrm{L}$

$\mathrm{M} \propto \frac{1}{\mathrm{~L}}$

$\mathrm{M} \propto \mathrm{L}^2$

$\mathrm{M} \propto \frac{1}{\mathrm{~L}^2}$

MHT CET 2025 23rd April Morning Shift

MCQ (Single Correct Answer)

-0

A square coil ABCD of side ' L ' is carrying a current in clockwise direction. A straight conductor carrying current $\mathrm{I}_2$ (upward direction) is kept parallel to side AB at a distance $\frac{\mathrm{L}}{3}$ in the plane of $A B C D$. The net force on the coil ABCD is ( $\mu_0=$ magnetic permeability)

$\frac{\mu_0 \mathrm{I}_1 \mathrm{I}_2}{3 \pi}$

$\frac{3 \mu_0 \mathrm{I}_1 \mathrm{I}_2}{4 \pi}$

$\frac{3 \mu_0 \mathrm{I}_1 \mathrm{I}_2}{8 \pi}$

$\frac{9 \mu_0 \mathrm{I}_1 \mathrm{I}_2}{8 \pi}$

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