Two point charges `0.01muC` and `-0.01muC` are place 10 cm apart in vacuum. Calculated the magnitude of electric field intensity at the middle point of the line joining the charges and mention its direction.

Two point charge +16muC and -9muC are placed at 8 cm apart in air. Determine the position of the point at which the resultant electric field is zero.

Two heavy spheres each of mass 100 kg and radius 0.10 m are placed 1.0 m apart on a horizontal table. What is the gravitational force and potential at the mid point of the line joining the centers of the spheres? Is an object placed at that point in equilibrium? If so, is the equilibrium stable or unstable?

Two charges each of magnitude 4muC are placed at two corners of an equilateral triangle of side 4m. Find the magnitude of electric field at the third corner.

Four point charges q, -q, 2q and - 2q are placed at the comers of a square of side 5 cm. If q= 5 * 10^-6 C , find the magnitude of the electric field at the intersection of the diagonals.

Two charges of 5 * 10^-6 C and -5 * 10^-6 C are placed 5 cm apart, at points A and B respectively. Find the electric field at C, 5 cm away from both A and B.

A spherical conductor of radius 10 cm has a charge of 3.2×10 ^−7 C distributed uniformly. What is the magnitude of electric field at a point 15cm from the centre of the sphere?