Question 21:
moderate
A galvanometer coil has a resistance of \(12\ \Omega\) and the meter show full scale deflection for a current of \(1\text{ mA}\). The resistance required to be added to convert the galvanometer into a voltmeter of range \(0\) to \(10\text{ V}\) will be
To convert a galvanometer into a voltmeter, a high resistance \(R\) is connected in series: \(V = I_g(G + R) \implies 10 = 10^{-3}(12 + R) \implies R = 9988\ \Omega\).