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A voltmeter reads the potential differen...

A voltmeter reads the potential difference across the terminals of an old battery as `1.40 V`, while a potentiometer reads its voltage to be `1.55 V`. The voltmeter resistance is `280 Omega`.

A

the emf of the battery is 1.4 V

B

the emf of the battery is 1.55 V

C

the internal resistance r of the battery is `30 Omega`

D

the internal resistance r of the battery is `5 Omega`

Text Solution

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The correct Answer is:
B, C
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DC PANDEY ENGLISH-CURRENT ELECTRICITY-All Questions
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  2. In the circuit shown in figure

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  4. A battery of emf E and internal resistance r is connected across a res...

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  6. Two bulbs consume same power when operated at 200 V and 300 V, respect...

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  7. Potential difference across the terminal of a non ideal battery is

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  8. Both terminals of a battery of emf E and internal resistance r are gro...

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  9. In the circuit shown in figure

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  10. In the circuit shown in figure potential difference across

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  11. The resistance of an ideal ammeter is

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  12. In the circuit shown in figure resistance of each wire is r. Net resis...

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  13. In the circuit shown in figure, power generated in

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  14. In the circuit shown in figure

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  15. Figure shows part of a circuit. Which points have the same potential a...

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  16. A galvanometer has resistance 1 Omega. Maximum deflection current thr...

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  17. In a potentiometer wire experiment the emf of a battery in the primary...

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  18. In the network shown in fig. , points A, B, and C are at potentials of...

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  19. The value of the resistance R in figure is adjusted such that power di...

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  20. In the circuit shown E, F, G and H are cells of emf 2V, 1V, 3V and 1V ...

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