A galvanometer of 50 ohm resistance has 25 divisions. A

A galvanometer of 50 ohm resistance has 25 divisions. A current of 4 × 10^–4 ampere gives a deflection of one per division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

1. 2450 Ω in series
2. 2500 Ω in series.
3. 245 Ω in series.
4. 2550 Ω in series.

R_g = 50Ω, I_g = 25 × 4 × 10^–AΩ = 10^–2 ARange of V = 25 volts
V = I_g(R_e + R_g)

∴ R_e =	V	- R_g = 2450 Ω
	I_g