OR (b) (i) What is current sensitivity of a galvanometer? Show how the current sensitivity of a galvanometer may be increased. "Increasing the current sensitivity of a galvanometer may not necessarily increase its voltage sensitivity." Explain. (ii) A moving coil galvanometer has a resistance $15 \text{ } \Omega$ and takes $20 \text{ mA}$ to produce full scale deflection. How can this galvanometer be converted into a voltmeter of range $0$ to $100 \text{ V}$?