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In a potentiometer experiment for measur...

In a potentiometer experiment for measuring the emf of cell, the null point is at 480 cm when we have a `400Omega` resistor in series with the cell and galvanometer . If the series resistances is reduced to half, the null point will be at

A

120 cm

B

240 cm

C

480 cm

D

600 cm

Text Solution

Verified by Experts

The correct Answer is:
C
At null point, no current flows through galvanometer. Therefore, the resistance connected in series with galvnometer, at null point position will be ineffective. Thus, null point is obtained on potentiometer wire at the original position after the removal of series resistance galvanometer.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CURRENT ELECTRICITY-EXERCISE 1
  1. Figure shows a circuit with known resistances R(1) and R(2) . Neglect ...

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  2. The potential difference across the terminals of a battery is 50 V whe...

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  3. In the circuit shown, the currents i(1) and i(2) are

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  4. A battery of emf 10 V and internal resistance 3Omegais connected to a ...

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  5. In the following circuit reading of voltmeter V is

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  6. In the electric circuit shown each cell has an emf of 2 V and internal...

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  7. Five conductors are meeting a point x as shown in the figures . What i...

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  8. Two resistors of resistances 2Omega and 6Omega are connected in parall...

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  9. Four identical cells of emf epsilon and internal resistance r are to b...

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  10. Two cells having an internal resistance of 0.2 Omega and 0.4 Omega are...

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  11. Two cells of emf E(1) and E(2) are joined in opposition (such that E(1...

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  12. A circuit consists of three bateries of emf E(1) = 1V, E(2)=2V and E(3...

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  13. Two identical cells whether connected in parallel or in series gives t...

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  14. The current pasing through the ideal ammeter in the circuit given belo...

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  15. In a typical wheatstone network the resistance in cyclic order are A=1...

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  16. In a potentiometer experiment for measuring the emf of cell, the null ...

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  17. In a Wheatstone's network, P=2Omega, Q=2Omega, R=2Omega and S=3Omega. ...

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  18. In a potentiometer experiment the balancing with a cell is at length 2...

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  19. For measurement of potential difference, potentiometer is perferred in...

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  20. Five resistance are connected as shown in the figure . The equivalent ...

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