A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

Question

Dr. Abubacker · Accepted Answer

[Solution from source] Total resistance needed = V/I_g = 30/0.030 = 1000 Ω. Series resistance = 1000 − 100 = 900 Ω. 1000 Ω forgets to subtract the coil's own resistance. Answer (2).

Q. A galvanometer has a coil of resistance 100 ohm and gives a full scale deflection for 30 mA current. If it is to work as a voltmeter of 30 volt range, the resistance required to be added will be

Explanation

Reviewed by Dr. Abubacker

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