WB JEE 2023 | Current Electricity Question 7 | Physics

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 8 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 2021

MCQ (Single Correct Answer)

-0.25

WB JEE 2021 Physics - Current Electricity Question 9 English

The carbon resistor with colour code is shown in the figure. There is no fourth band in the resistor. The value of the resistance is

24 M$$\Omega$$ $$\pm$$ 20%

14 k$$\Omega$$ $$\pm$$ 5%

24 k$$\Omega$$ $$\pm$$ 20%

34 k$$\Omega$$ $$\pm$$ 10%

WB JEE 2021

MCQ (Single Correct Answer)

-0.5

Two metal wires of identical dimensions are connected in series. If $$\sigma$$₁ and $$\sigma$$₂ are the electrical conductivities of the metal wires respectively, the effective conductivity of the combination is

$$\sigma$$₁ + $$\sigma$$₂

$${{{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$

$${{2{\sigma _1}{\sigma _2}} \over {{\sigma _1} + {\sigma _2}}}$$

$${{{\sigma _1} + {\sigma _2}} \over {2{\sigma _1}{\sigma _2}}}$$

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