Question

34. (a): State the relation between potential difference, work done and charge moved.

Answer 1

Answer:

Potential difference between two points is equal to the work done in moving a unit positive charge from the point of lower potential to the point of higher potential.

Explanation:

Consider the points A & B having potentials V2 and V1 respectively. Point A at higher potential than point B .

The work done in bringing a unit positive charge from infinity to point B is V1 joule,

i.e. VB =V1 volt.

Suppose that extra work done to bring the unit positive charge from B to A is W joule .

then, potential at point A,

VA = V1 + W volt

then, VA - VB = (V1 + W) - V1 = W

or, V2 - V1 = W.D in moving a unit positive charge from point B to A .

UNITS : volt : can be defined as if 1 joule of work is done in moving 1C charge from one point to another.