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In order to increase the sensitivity of ...

In order to increase the sensitivity of a moving coil galvanometer, ______ should be decreased.

A

magnetic field B

B

torsional constant of a spring k

C

no. of turns in a coil N

D

none of above

Text Solution

Verified by Experts

The correct Answer is:
B
Sensitivity of a galvanometer is,
`Phi/I=(NAB)/krArr(Phi/I)prop1/k`
`rArr` By decreasing torsional constant of a spring, we can increase current sensitivity.
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KUMAR PRAKASHAN-MOVING CHARGES AND MAGNETISM-SECTION D (MULTIPLE CHOICE QUESTIONS)
  1. Which of following statements is wrong?

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  2. There are three voltmeters of same range with resistance 10,000Omega,8...

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  3. In order to increase the sensitivity of a moving coil galvanometer, s...

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  4. If range of an ammeter with resistance 5Omega is to be made double the...

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  5. is known as current sensitivity of a galvanometer.

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  6. is known as voltage sensitivity of galvanometer.

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  7. Relation between voltage sensitivity (sigma(v)) and current sensitivit...

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  8. When 50Omega resistance is connected to one voltmeter, its range is ob...

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  9. When 3 mA and 5 mA currents are passed through two galvanometers P and...

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  10. 1A current is passed through a parallel combination of 8Omega resistan...

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  11. When 2.5Omega shunt is connected with 25Omega resistance of galvanomet...

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  12. Give unit of torsional constant.

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  13. To turn galvanometer into ammeter,

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  14. Resistance of galvanometer is G. If shunt required to make its range n...

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  15. Resistance of ammeter is ROmega. What will be the required shunt to de...

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  16. The resistance of galvanomenter is G and its current capacity is I(g)....

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  17. A galvanometer coil has a resistance of 12Omega and the metre shows fu...

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  18. The current capacity of ammeter having 9Omega resistance is 1A. Now to...

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  19. Range of voltmeter with increase in series resistance.

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  20. Resistance of ammeter made by combination of 20Omega galvanometer and ...

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