Two charged particles having equal charge of `3xx10^-5C` each are brought from infinity to a separation of 30 cm. Find the increase in electrostatic potential energy during the process.

Two point charges 20 xx l0^-6C and -4 xx l0^-6C are separated by a distance of 50cm in air. Calculate the electrostatic potential energy of the system.

Two point charges of magnitudes +100muC and -400muC are kept 30 cm apart. Find the point of zero potential on the line joining the two charges.

Two charges of magnitude 5 nC and -2 nC are placed at points (2 cm, 0, 0) and (20 cm, 0, 0) in a region of space, where there is no other external field. Find the electrostatic potential energy of the system.

Two point charges of 5muC and 15 muC are placed in air 20cm apart. Find the electric potential at the middle point of the line joining the two charges.

If 15 J of work is done when a charge of 3 C is moved from one point to another, find the electric potential difference between the two points.

1f 20 J of work is done in moving a charge of 5C from one point to another, find the electric potential difference between the two points.

A charged particle moves with velocity of 3 xx 10^6 m//s at right angle to a uniform field of magnetic field 0.005 T. Find the value of the charge on the particle if it experience a force of 2 xx 10^-2 N .