1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
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WB JEE 2024 Physics - Current Electricity Question 1 English

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

A
$$\mathrm{R}=\mathrm{r}$$
B
$$\mathrm{R}=2 \mathrm{r}$$
C
$$\mathrm{R}=3 \mathrm{r}$$
D
$$\mathrm{R}=\frac{\mathrm{r}}{3}$$
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
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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,

A
20 $$\Omega$$
B
320 $$\Omega$$
C
160 $$\Omega$$
D
1.44 k $$\Omega$$
3
WB JEE 2023
MCQ (Single Correct Answer)
+2
-0.5
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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,

A
$$\frac{4 Q^{2} \mathrm{R}}{3 \mathrm{~T}}$$
B
$$\frac{2 \mathrm{QR}}{3 \mathrm{~T}}$$
C
$$\frac{\mathrm{Q}^{2} \mathrm{~T}}{4 \mathrm{R}}$$
D
$$\mathrm{Q}^{2} \mathrm{RT}$$
4
WB JEE 2022
MCQ (Single Correct Answer)
+1
-0.25
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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

A
r << R
B
r >> R
C
r = R
D
It will never act as a constant voltage source.
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