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Q. No.Which of the following statements about a moving coil galvanometer is incorrect?
| 1. | The spring in a galvanometer provides a counter torque that balances the magnetic torque. |
| 2. | A galvanometer has multiple turns of wire to enhance the torque acting on the coil. |
| 3. | In all positions, the magnetic field \(B\) remains parallel to the plane of the coil. |
| 4. | The deflection \(\phi\) indicated by the scale is proportional to the square of the current flowing through the coil. |
Subtopic: Â Moving Coil Galvanometer |
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From NCERT
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In a moving coil galvanometer, the number of turns in the coil are increased to increase the current sensitivity by \(50\text{%}.\) The percentage change in voltage sensitivity is:
1. \(-50\text{%}\)
2. \(50\text{%}\)
3. no change
4. \(25\text{%}\)
1. \(-50\text{%}\)
2. \(50\text{%}\)
3. no change
4. \(25\text{%}\)
Subtopic: Â Moving Coil Galvanometer |
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From NCERT
JEE
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Given below are two statements:
| Statement I: | If a galvanometer is connected with a high resistance in series with it, it can be used as an ammeter. |
| Statement II: | If a galvanometer is connected with a low resistance in parallel with it, it can be used as a voltmeter. |
| 1. | Statement I is incorrect and Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct and Statement II is incorrect. |
Subtopic: Â Moving Coil Galvanometer |
 77%
From NCERT
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The current sensitivity of a moving coil galvanometer is \(1~\text{rad /A}\) and its resistance is \(5~\Omega\)
1. \(0.2~\text{rad/V}\)
2. \(0.1~\text{rad/V}\)
3. \(1~\text{rad/V}\)
4. \(2~\text{rad/V}\)
Subtopic: Â Moving Coil Galvanometer |
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The deflection of a moving coil galvanometer falls from \(60\) divisions to \(12\) divisions for the same value of current in the circuit, when a shunt of \(12~\Omega\) is connected. The resistance of the galvanometer is:
| 1. | \(2~\Omega\) | 2. | \(20~\Omega\) |
| 3. | \(48~\Omega\) | 4. | \(96~\Omega\) |
Subtopic: Â Moving Coil Galvanometer |
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From NCERT
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Q. No.
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