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A potentiometer wire of length 10m and r...

A potentiometer wire of length 10m and resistance 30 ohm is connected in series with a battery of emf 2.5V, internal resistance 5 ohm and external resistance R. If the fall of potential along the potentiometer wire is 50mV/m, the value of R is ohms is

A

115

B

80

C

50

D

100

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-APPENDICES ( REVISION EXERCISE )-REVISION EXERCISE (CUTTENT ELECTRICITY )
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  2. In a meter bridge, the left and right gaps are closed by resistances 2...

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  3. A battery of internal resistance 4 Omega is connected to he network of...

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  4. A resistance of 2Omega is connected across one gap of a meter bridge (...

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  5. A student finds the balancing length to be 'l' with a cell of constant...

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  6. In an experiment with potentiometer to measure the internal resistance...

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  7. A potentiometer wire of length 100cm has a resistance of 10Omega. It i...

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  8. A 1Ω resistance in series with an ammeter is balanced by 75 cm of pot...

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  9. A potentiometer wire of length 200cm has a resistance of 20Omega It is...

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  10. In an experiment for calibration of voltmeter, a standard cell of emf ...

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  11. A potentiometer wire of length 10m and resistance 30 ohm is connected ...

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  12. A potentiometer wire of 5m length and having 20Omega resistance is con...

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  13. In the primary circuit of a potentiometer, a cell of E.M.F 1 V and a r...

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  14. A potentiometer wire of length 1.0 m has a resistance of 15Omega. It i...

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  15. A potentiometer wire of 5m length and having 20Omega resistance is con...

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  16. A thermocouple has its junctions at 0^@ C and 100^@ C. It produces 0.0...

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  17. A cell of emf 1.6 V is connected across a potentiometer wire of length...

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  18. In the circuit shown in fig., the potential difference between the poi...

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  19. The length of potentiometer wire is 1m and its resistance is 4Omega. A...

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  20. In the arrangement shows in fig. , when the switch S2 is open, the gal...

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