Potentiometer
It is an arrangement used to measure accurate potential difference & is equivalent to an ideal voltmeter & based on null method.
It is based on the principle that if a constant current is passed through a wire of uniform resistivity than potential difference across a given length of wire is directly proportional to length of that part.
Dynamics
^Dynamics is a branch of physics which deals with the study of motion of the objects considering their cause also.
^Relations between AU, Ly and parsec
^A long horizontal fixed wire carries a current of 100 A. Directly above and parallel to it is another wire carrying a current of 20 A and weighing 0.04 N/m. The separation between the two wires so that the upper wire is just supported by the magnetic repulsion is
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