Electric Potential at a point in an electric field is the work done per unit charge by an external agent in bringing a positive test charge from infinity to that particular point without acceleration.
- E-field lines always point from region of high potential(+) to regions of low potential (-)
- Unit: Volts (V)
Various equations for electric potential:
$$V = \frac{W}{q}$$
, where
- V is electric potential,
- W is work/energy,
- q is charge
$$V = \frac{Q}{4 \pi \epsilon_{o} r}$$
, where
- V is electric potential,
- Q is charge,
- r is distance from the charge
$V = Er$
, where
- V is electric potential,
- E is electric field,
- r is distance from the charge
Electric potential of a positive charge decreases with increasing r.
Electric potential of a negative charge increases with increasing r.
