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WB JEE 2022 Physics - Magnetism Question 6 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?

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 2022
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A sample of hydrogen atom in its ground state is radiated with photons of 10.2 eV energies. The radiation from the sample is absorbed by excited ionized He+. Thenwhich of the following statement/s is/are true?

A
He+ electron moves from n = 2 to n = 4.
B
In the He+ emission spectra, there will be 6 lines.
C
Smallest wavelength of He+ spectrum is obtained when transition taken place from n = 4 to n = 3.
D
He+ electron moves from n = 2 to n = 3.
3
WB JEE 2022
MCQ (More than One Correct Answer)
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A particle is moving in x-y plane according to $$\overrightarrow r = b\cos \omega t\widehat i + b\sin \omega t\widehat j$$, where $$\omega$$ is constant. Which of the following statement(s) is/are true?

A
$${E \over \omega }$$ is a constant where E is the total energy of the particle.
B
The trajectory of the particle in x-y plane is a circle.
C
In ax - ay plane, trajectory of the particle is an ellipse (ax, ay denotes the components of acceleration)
D
$$\overrightarrow a = {\omega ^2}\overrightarrow v $$
4
WB JEE 2022
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WB JEE 2022 Physics - Properties of Matter Question 9 English

Two wires A and B of same length are made of same material. Load (F) vs. elongation (x) graph for these two wires is shown in the figure. Then which of the following statement(s) is/are true?

A
The cross-section area of A is greater than that of B.
B
Young's modulus of A is greater than Young's modulus of B.
C
The cross-sectional area of B is greater than that of A.
D
Young's modulus of both A and B are same.
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