A galvanometer has a resistance of 20 ohms and a full-scale deflection when a current of 0.001 ampere flows in it. What is the value of the series resistance to convert it into a voltmeter of range 10 volts?
Correct answer: B. 9980 ohms
- A. 7780 ohms
- B. 9980 ohms
- C. 5580 ohms
- D. 4480 ohms
- E. 3380 ohms
Explanation
As we know when converting a galvanometer into a voltmeter, we use the formula Rh=V/Ig -Rg where Rh is the series resistance V is the voltage Ig is a full-scale deflection Rg is the resistance of the galvanometer so by putting values: Rh=10/0.001 -20 Rh=9980 ohm
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