How can you increase the sensitivity of a potentiometer?

A circuit diagram of an instrument is given below. . How can increase the sensitivity of this instrument?

A rectangular loop of area A and carrying a steady current I is placed in a uniform magnetic field:-Increasing the current sensitivity may not necessarily increase the voltage sensitivity of a galvanometer. Justify.

How will you increase the reduction potential of an electrode?

Give the basic principle of potentiometer.

Expression for voltage sensitivity Is theta/V=(NAB)/(CR) How will you increase the voltage sensitivity?