1
WB JEE 2022
MCQ (More than One Correct Answer)
+2
-0

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?

A
Current in the loop I = $${{Bbv} \over {\lambda (2b + 2a)}}$$
B
Current will be in clockwise direction, looking from the top.
C
VP $$-$$ VS = VQ $$-$$ VR, where V is the potential.
D
There cannot be any induction in part SR.
2
WB JEE 2021
MCQ (More than One Correct Answer)
+2
-0

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?
A
Magnetic field at the centre O of the circular coil due to the bar magnet is $${M \over {{x^3}}}$$
B
Induced emf is proportional to $${1 \over {{x^4}}}$$
C
The magnetic moment $$\mu$$ due to induced current in the coil is proportional to a4
D
The heat produced is proportional to $${1 \over {{x^6}}}$$
3
WB JEE 2020
MCQ (More than One Correct Answer)
+2
-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?
A
E $$\ne$$ 0, B $$\ne$$ 0
B
E $$\ne$$ 0, B = 0
C
E = 0, B = 0
D
E = 0, B $$\ne$$ 0
4
WB JEE 2019
MCQ (More than One Correct Answer)
+2
-0
A metallic loop is placed in a uniform magnetic field B with the plane of the loop perpendicular to B. Under which condition(s) given an emf will be induced in the loop? "If the loop is ............"
A
moved along the direction of B.
B
squeezed to a smaller area
C
D
rotated about one of its diameters
WB JEE Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
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