The galvanometer deflection, when key K1 is closed but is open equals θ0 (see figure). On closing K2 also and adjusting R2 to 5 Ω, the deflection in galvanometer becomes \(\frac{{{{\rm{\theta }}_0}}}{5}\). The resistance of the galvanometer is given by (neglect the internal resistance of battery):

• A. 22 Ω
• B. 5 Ω
• C. 25 Ω
• D. 12 Ω