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In a moving coil galvanometer, the magne...

In a moving coil galvanometer, the magnetic field used is 5T. The coil has 100 turns, each of mean area `10 xx 10^(-4)` m^(2). If a current of `10^(-7)` A produces a deflection of 1 mm on a scale 1m away, calcualte the current reduction factor of the galvanometer and the torsional rigidity of the suspension wire.

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The correct Answer is:
`2xx10^(-4)` A perradian, `10^(-4)` Nm per radina
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NN GHOSH-GALVANOMETERS: AMMETER AND VOLTMETERS-Exercise
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  2. A moving coild galvanometer with a lamp-and-scale arrangement has a co...

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  3. In a moving coil galvanometer, the magnetic field used is 5T. The coil...

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  4. A milliammeter has a resistance of 10Omega and each division of its gr...

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  5. A moving coil galvanometer has a resistance of 200Omega and gives a fu...

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  6. A voltmeter with a resistance of 8000Omega is used to measure the emf ...

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  7. A cheap voltmeter with an internal resistance of 30Omega is connected ...

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  8. A voltmeter of range of 10 V and resistance 5000 Omega is connected in...

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  9. There is a milliameter, each division of which reads 1 mA. It has a re...

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  10. An ammeter of resistance 0.02 Omega is connected in the usual may to a...

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  11. A voltmeter of resistance 3000Omega can read up to 10 V. how would you...

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  12. A millimmater of resistance 20Omega reads up to 50 mA. Explain how the...

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  13. A battery of emf 5V and internal resistance 20Omega is connected to a ...

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  14. A 150 V voltmeter has a resistance of 20,000Omega when connected in se...

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  15. A moving coild galvanometer of resistance 20Omega gives a full scale d...

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  16. Two tangent galvanometer of 50 and 100 tunrs of the same wire and radi...

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  17. A 600Omega resistor and a 400Omega resistor are connected in series ac...

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  18. Three voltmeters A, B and C have the same range but different resistan...

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  19. A galvanometer with a coil resistance of 100Omega shows a full-scale d...

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  20. When the modified galvanometer of exercise 26 is connected across the ...

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