A galvanometer coil has a resistance of 15 Ω and gives full-scale deflection for a current of 5 mA. To convert this galvanometer into a voltmeter reading 0–10 V, what resistance must be connected in series with it?

PhysicsMediumHigh School (11–12)jee-main

A voltmeter is made from a galvanometer by connecting a high resistance $R$ in series, so that only a small current (the full-scale deflection current $I_g$ ) flows through the combination when the maximum voltage $V$ is applied across it: $V = I_g(G+R)$ .

A galvanometer coil has a resistance of $15\ \Omega$ and gives full-scale deflection for a current of $5\text{ mA}$ . To convert this galvanometer into a voltmeter reading $0$ – $10\text{ V}$ , what resistance must be connected in series with it?

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