1
WB JEE 2022
MCQ (Single Correct Answer)
+2
-0.5
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Three concentric metallic shells A, B and C of radii a, b and c (a < b < c) have surface charge densities +$$\sigma$$, $$-$$$$\sigma$$ and +$$\sigma$$ respectively. The potential of shell B is

WB JEE 2022 Physics - Current Electricity Question 11 English

A
$$(a + b + c){\sigma \over {{\varepsilon _0}}}$$
B
$${{\sigma c} \over {{\varepsilon _0}}}$$
C
$$\left( {{{{a^2}} \over c} - {{{b^2}} \over c} + c} \right){\sigma \over {{\varepsilon _0}}}$$
D
$$\left( {{{{a^2}} \over c} - b + c} \right){\sigma \over {{\varepsilon _0}}}$$
2
WB JEE 2022
MCQ (Single Correct Answer)
+2
-0.5
Change Language

One mole of an ideal monoatomic gas expands along the polytrope PV3 = constant from V1 to V2 at a constant pressure P1. The temperature during the process is such that molar specific heat $${C_V} = {{3R} \over 2}$$. The total heat absorbed during the process can be expressed as

A
$${P_1}{V_1}\left( {{{V_1^2} \over {V_2^2}} + 1} \right)$$
B
$${P_1}{V_1}\left( {{{V_1^2} \over {V_2^2}} - 1} \right)$$
C
$${P_1}{V_1}\left( {{{V_1^3} \over {V_2^2}} - 1} \right)$$
D
$${P_1}{V_1}\left( {{{V_1^{}} \over {V_2^2}} - 1} \right)$$
3
WB JEE 2022
MCQ (More than One Correct Answer)
+2
-0
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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.
4
WB JEE 2022
MCQ (More than One Correct Answer)
+2
-0
Change Language

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.
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