Question

The electric volt is a measure of electric potential. Identify which of the following can be defined as volt.
A. Opposition to electric motion
B. Number of particles in motion
C. Work per unit charge
D. Field strength per unit force
E. Electrostatic discharge

Answer 1

Electric potential and potential difference both are defined as work per unit charge. For example, the potential to move a charge from one point to another does some work that corresponds to the charge being moved.

Complete Answer:
The electric potential at a point in a field can be defined as the amount of work done in bringing a unit positive test charge from infinity to that point along an arbitrary path where infinity is a point of zero potential. It is deNoted by V.
$v = \dfrac{w}{q}$
Where, W is the work done in moving a charge q.
$S.I\,\,unit = \dfrac{{joule}}{{coulomb}} = J{C^{ - 1}} = volt(V)$
The dimensional formula
$[V] = [{M^1}{L^2}{T^{ - 3}}{A^{ - 1}}]$
According to the nature of the charge, two types of positive and negative potential exists.
Hence, the correct option is C.

Additional Information: :
The electric potential due to a point is given by
$V = k\dfrac{q}{r}$
Where,
$k = \dfrac{1}{{4\pi {\varepsilon _0}}} = 9 \times {10^9}N{m^2}{C^{ - 2}}$
Using the above relation, electric potential due to continuous charge distribution is
$V = \smallint dV = \smallint \dfrac{{dq}}{{4\pi {\varepsilon _0}r}}$

Note: Potential difference is the difference in the electric potential between two points which is the work done in moving a charge from one point to another.