- 1(current)
Q. No.When will the current sensitivity of a moving coil galvanometer be high?
(\(N=\) number of turns, \(B=\) magnetic field, \(A=\) area of coil, and \(C=\) Torsional constant of spring)
(\(N=\) number of turns, \(B=\) magnetic field, \(A=\) area of coil, and \(C=\) Torsional constant of spring)
| 1. | \(N\) is small | 2. | \(B\) is small |
| 3. | \(A\) is small | 4. | \(C\) is small |
Subtopic: Â Moving Coil Galvanometer |
 85%
Level 1: 80%+
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Which among the following options needs to be decreased to increase the sensitivity of a moving coil galvanometer?
| 1. | the number of turns in the coil. | 2. | the area of the coil. |
| 3. | the magnetic field. | 4. | the couple per unit twist of the suspension. |
Subtopic: Â Moving Coil Galvanometer |
 81%
Level 1: 80%+
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By which relation is the deflection of the coil \(\theta\) related to the electrical current \(i\) in a moving coil galvanometer?
1. \(i \propto \tan \theta\)
2. \(i \propto \theta\)
3. \(i \propto \theta^{2}\)
4. \(i \propto \sqrt{\theta}\)
1. \(i \propto \tan \theta\)
2. \(i \propto \theta\)
3. \(i \propto \theta^{2}\)
4. \(i \propto \sqrt{\theta}\)
Subtopic: Â Moving Coil Galvanometer |
 80%
Level 1: 80%+
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The current sensitivity of a moving coil galvanometer is \(5\) div/mA and its voltage sensitivity (angular deflection per unit voltage applied) is \(20\) div/V. How much is the resistance of the galvanometer?
| 1. | \(40~ \Omega\) | 2. | \(25~ \Omega\) |
| 3. | \(250~ \Omega\) | 4. | \(500~ \Omega\) |
Subtopic: Â Moving Coil Galvanometer |
 75%
Level 2: 60%+
NEET - 2018
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What happens when the number of turns in a galvanometer is doubled?
| 1. | The voltage sensitivity becomes double. |
| 2. | The current sensitivity becomes double. |
| 3. | the voltage sensitivity becomes half. |
| 4. | The current sensitivity remains the same. |
Subtopic: Â Moving Coil Galvanometer |
 76%
Level 2: 60%+
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What is the relation between voltage sensitivity \((\sigma_v)\) and current sensitivity \((\sigma_i)\) of a moving coil galvanometer? (Resistance of Galvanometer = \(G\))
1. \(\frac{\sigma_{i}}{G} = \sigma_{v}\)
2. \(\frac{\sigma_{v}}{G} =\sigma_{i}\)
3. \(\frac{G}{\sigma_{v}} =\sigma_{i}\)
4. \(\frac{G}{\sigma_{i}} =\sigma_{v}\)
1. \(\frac{\sigma_{i}}{G} = \sigma_{v}\)
2. \(\frac{\sigma_{v}}{G} =\sigma_{i}\)
3. \(\frac{G}{\sigma_{v}} =\sigma_{i}\)
4. \(\frac{G}{\sigma_{i}} =\sigma_{v}\)
Subtopic: Â Moving Coil Galvanometer |
 77%
Level 2: 60%+
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The current sensitivity of a galvanometer can be increased by:
Choose the most appropriate answer from the options given below:
| A. | decreasing the number of turns. |
| B. | increasing the magnetic field. |
| C. | decreasing the area of the coil. |
| D. | decreasing the torsional constant of the spring. |
| 1. | (B) and (C) only |
| 2. | (C) and (D) only |
| 3. | (A) and (C) only |
| 4. | (B) and (D) only |
Subtopic: Â Moving Coil Galvanometer |
 91%
Level 1: 80%+
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