WB JEE 2023 | Current Electricity Question 7 | Physics

WB JEE 2023

MCQ (Single Correct Answer)

-0.5

An amount of charge Q passes through a coil of resistance R. If the current in the coil decreases to zero at a uniform rate during time T, then the amount of heat generated in the coil will be,

$$\frac{4 Q^{2} \mathrm{R}}{3 \mathrm{~T}}$$

$$\frac{2 \mathrm{QR}}{3 \mathrm{~T}}$$

$$\frac{\mathrm{Q}^{2} \mathrm{~T}}{4 \mathrm{R}}$$

$$\mathrm{Q}^{2} \mathrm{RT}$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

WB JEE 2022 Physics - Current Electricity Question 12 English

A battery of emf E and internal resistance r is connected with an external resistance R as shown in the figure. The battery will act as a constant voltage source if

r << R

r >> R

r = R

It will never act as a constant voltage source.

WB JEE 2022

MCQ (Single Correct Answer)

-0.5

Find the equivalent capacitance between A and B of the following arrangement :

WB JEE 2022 Physics - Current Electricity Question 10 English

$${{2C} \over 3}$$

$${{3C} \over 2}$$

WB JEE 2022

MCQ (Single Correct Answer)

-0.5

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

$$(a + b + c){\sigma \over {{\varepsilon _0}}}$$

$${{\sigma c} \over {{\varepsilon _0}}}$$

$$\left( {{{{a^2}} \over c} - {{{b^2}} \over c} + c} \right){\sigma \over {{\varepsilon _0}}}$$

$$\left( {{{{a^2}} \over c} - b + c} \right){\sigma \over {{\varepsilon _0}}}$$

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