4.27 A galvanometer coil has a resistance of 12 Ω and the meter shows full scale deflection for a current of 3 mA. How will you convert the meter into a voltmeter of range 0 to 18 V?
4.27 A galvanometer coil has a resistance of 12 Ω and the meter shows full scale deflection for a current of 3 mA. How will you convert the meter into a voltmeter of range 0 to 18 V?
4.27 Resistance of the galvanometer coil, G = 12 Ω
Current for which there is full scale deflection, = 3 mA = 3 A
Range of voltmeter = 0, to be converted to 18 V, hence V = 18 V
Let there be a resistor R connected in series with the galvanometer to convert it into a voltmeter. R is given as
R = -
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Physics Ncert Solutions Class 12th 2026
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