Measurement of the coonductivity of electrolytic solutions is done with the helpof Wheatstone bridge using a/an

Options

A. battery
B. induction coil
C. conductivity cell
D. both (2) and (3)

Answer

D

Explanation

Induction coil, an alternating current `(A)` source of power is used to nullify the electrolysis of the electrolyte while conductivity cell is used to connet the electrolytic solution to the bridge like a matallic wire or other solid conductor. Galvanometer is replaced by an earphone bacause when `AC` source is used, ordinary galvanometer fails to detect the null point.