In a potentiometer arrangement, a cell of emf $$1.25$$ V gives a balance point at $$35.0$$ cm length of the wire. If the cell is replaced by another cell and the balance point shifts to $$63.0$$ cm, then the emf of the second cell is:
1. $$1.27$$ V
2. $$2.25$$ V
3. $$3.27$$ V
4. $$3.25$$ V

Subtopic:  Meter Bridge & Potentiometer |
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Figure shows a potentiometer with a cell of 2.0 V and internal resistance 0.40 Ω maintaining a potential drop across the resistor wire AB. A standard cell which maintains a constant emf of 1.02 V (for very moderate currents up to a few mA) gives a balance point at 67.3 cm length of the wire. To ensure very low currents drawn from the standard cell, a very high resistance of 600 kΩ is put in series with it, which is shorted close to the balance point. The standard cell is then replaced by a cell of unknown emf ε and the balance point found similarly, turns out to be at 82.3 cm length of the wire. The value of ε is:

1. 1.33 V
2. 1.50 V
3. 1.24 V
4. 1.07 V

Subtopic:  Meter Bridge & Potentiometer |
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Figure shows a potentiometer circuit for comparison of two resistances. The balance point with a standard resistor R=10.0 Ω is found to be 58.3 cm, while that with the unknown resistance X is 68.5 cm. The value of X is:

1. $12.1\Omega$

2.

3.

4.

Subtopic:  Meter Bridge & Potentiometer |
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The figure shows a 2.0 V potentiometer used for the determination of the internal resistance of a 1.5 V cell. The balance point of the cell in the open circuit is 76.3 cm. When a resistor of 9.5 Ω is used in the external circuit of the cell, the balance point shifts to 64.8 cm length of the potentiometer wire. The internal resistance of the cell is:

1. $$1.68~\Omega$$
2. $$0.13~\Omega$$
3. $$0.31~\Omega$$
4. $$1.12~\Omega$$

Subtopic:  Meter Bridge & Potentiometer |
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