The term 'Poisson's ratio' is connected with

If J is moment of Inertia, D is damping constant, C is spring constant, G is displacement constant and I is current throught the coil of DArsonval galvanometer, the equation of motion is

While calibrating an ammeter by a dc potentiometer it is necessary to use a standard resistance.

The flow rate of electrically conducting liquid without any suspended particle can not be measured by

An electrostatic voltmeter is suitable for