A tiny spherical oil drop carrying a net charge q is balanced in still air with a vertical uniform electrical field of strength \(\frac{81}{7}\pi\) x 105 V/m.When the field is switched off, the drop is observed to fall with terminal velocity 2 x 10-3 m/s. Here g = 9.8 m/s2, viscosity of air is 1.8 x 10-5 N/m2 and the density of the oil is 900 kg/m3. The magnitude of 'q' is
Four charges +q, +2q, +q and -2q are placed at the corner of square ABCD respectively. The force on unit positive charge kept at the centre 'O' is
The electrostatic potential is also known as the electric field potential, electric potential, or potential drop is defined as “The amount of work that is done in order to move a unit charge from a reference point to a specific point inside the field without producing an acceleration.”
SI unit of electrostatic potential - volt
Other units - statvolt
Symbol of electrostatic potential - V or φ
Dimensional formula - ML2T3I-1
The electric potential energy of the system is given by the following formula:
U = 1/(4πεº) × [q1q2/d]
Where q1 and q2 are the two charges that are separated by the distance d.