WB JEE 2026 | Magnetism Question 4 | Physics

WB JEE 2026

MCQ (More than One Correct Answer)

-0.25

The magnetic moment of an iron bar is $M$. It is now bent in such a way that it forms an arc section of a circle subtending an angle of $60^{\circ}$ at the centre. The magnetic moment of the arc section is

$\frac{3 M}{\pi}$

$\frac{4 M}{\pi}$

$\frac{M}{\pi}$

$\frac{2 M}{\pi}$

WB JEE 2022

MCQ (More than One Correct Answer)

-0

WB JEE 2022 Physics - Magnetism Question 11 English

As shown in figure, a rectangular loop of length 'a' and width 'b' and made of a conducting material of uniform cross-section is kept in a horizontal plane where a uniform magnetic field of intensity B is acting vertically downward. Resistance per unit length of the loop is $$\lambda$$ $$\Omega$$/m. If the loop is pulled with uniform velocity 'v' in horizontal direction, which of the following statement is/are true?

Current in the loop I = $${{Bbv} \over {\lambda (2b + 2a)}}$$

Current will be in clockwise direction, looking from the top.

V_P $$-$$ V_S = V_Q $$-$$ V_R, where V is the potential.

There cannot be any induction in part SR.

WB JEE 2021

MCQ (More than One Correct Answer)

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WB JEE 2021 Physics - Magnetism Question 15 English

A small bar magnet of dipole moment M is moving with speed v along x-direction towards a small closed circular conducting loop of radius a with its centre O at x = 0 (see figure). Assume x >> a and the coil has a resistance R. Then, which of the following statements is/are true?

Magnetic field at the centre O of the circular coil due to the bar magnet is $${M \over {{x^3}}}$$

Induced emf is proportional to $${1 \over {{x^4}}}$$

The magnetic moment $$\mu$$ due to induced current in the coil is proportional to a⁴

The heat produced is proportional to $${1 \over {{x^6}}}$$

WB JEE 2020

MCQ (More than One Correct Answer)

-0

A charged particle moves with constant velocity in a region, where no effect of gravity is felt but an electrostatic field E together with a magnetic field B may be present. Then, which of the following cases are possible?

E $$ \ne $$ 0, B $$ \ne $$ 0

E $$ \ne $$ 0, B = 0

E = 0, B = 0

E = 0, B $$ \ne $$ 0

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