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A moving coild galvanometer with a lamp-...

A moving coild galvanometer with a lamp-and-scale arrangement has a coil of 50 turns of mean area 1.5 `cm^(2)` per turn and the effective strength of the field (radial) is 0.02T. If a current of `10^(-9)` A produces a deflection of 1 cm on a scale placed at 1 m away, calcualte the steady torque required to hold the suspension twisted through 1 radian.

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The correct Answer is:
`3xx10^(-11)Nm`
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NN GHOSH-GALVANOMETERS: AMMETER AND VOLTMETERS-Exercise
  1. A circular loop of 50 turns and an area of 20 cm^(2) is placed in a ma...

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  2. A galvanometer coil of rectangular shape of length 4 cm and width 2 cm...

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  3. A moving coild galvanometer with a lamp-and-scale arrangement has a co...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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