WB JEE 2024 | Current Electricity Question 5 | Physics

Consider a circuit where a cell of emf $$E_0$$ and internal resistance $$\mathrm{r}$$ is connected across the terminal $$\mathrm{A}$$ and $$\mathrm{B}$$ as shown in figure. The value of $$\mathrm{R}$$ for which the power generated in the circuit is maximum, is given by

$$\mathrm{R}=\mathrm{r}$$

$$\mathrm{R}=2 \mathrm{r}$$

$$\mathrm{R}=3 \mathrm{r}$$

$$\mathrm{R}=\frac{\mathrm{r}}{3}$$

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

WB JEE 2023 Physics - Current Electricity Question 2 English

In an experiment on a circuit as shown in the figure, the voltmeter shows 8 V reading. The resistance of the voltmeter is,

20 $$\Omega$$

320 $$\Omega$$

160 $$\Omega$$

1.44 k $$\Omega$$

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 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.

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