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  • A galvanometer having a coil resistance 100 gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance (in range of <

A galvanometer having a coil resistance 100 \Omega gives a full scale deflection when a current of 1 mA is passed through it. What is the value of the resistance (in range of k\Omega )which can convert this galvanometer into a voltmeter giving full-scale deflection for a potential difference of 10 V ?
Option: 1 9.9
Option: 3 10
Option: 5 8.9
Option: 7 7.9
 

Answers (1)

best_answer

 

 

 

 

 

 \begin{aligned} V_{g} &=i_{g} R_{g}=0.1 \mathrm{V} \\ V &=10 \mathrm{V} \\ \mathrm{R} &=\mathrm{R}_{g}\left(\frac{\mathrm{V}}{\mathrm{V}_{g}}-1\right) \\ &=100 \times 99=9.9 \mathrm{K} \Omega \end{aligned}

Hence the correct option is (1).

Posted by

vishal kumar

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