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It is required to measure the resistance ofa circuit operating at 120V. There is only one galvanometer of current sensitivity `10^(-6)` A per division. How should the galvanometer be connected in the circuit to operate as an ohmmeter? What minimum resistance can be measured with such a galvanometer if its full scale has 40 division? Construct the entire scale of such an ohmmeter in ohms per 5 division? Neglect galvanometer resistance.

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The correct Answer is:
In seires;`3MOmega;prop,24,12,8,6,4,3.43,3MOmega`
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It is required to measure the resistance of a circuit operating at 120 V . There is only one galvanometer of current sensitivity 10^(-6) A per division. How should the galvanometer be connected in the circuit to operate an ohmmeter? Why minimum resistance can be measured with such a galvanometer if its full-scale has 40 divisions?

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NN GHOSH-GALVANOMETERS: AMMETER AND VOLTMETERS-Exercise
  1. A voltmeter with a resistance of 8000Omega is used to measure the emf ...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  16. An ammeter and a voltmeter are connected in series to a battery of emf...

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  17. An ammeter and a voltmeer are connected as in figures in order to ...

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  18. It is required to measure the resistance ofa circuit operating at 120V...

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  19. A resistance DeltaR=1980 Omega is connected in series with a voltmeter...

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  20. What should the resistance of the sections of a rheostat R(1), R(2) an...

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