Electric Charge...

Given that $$q_1 + q_2 = q$$. If the force between $$q_1$$ and $$q_2$$ is maximum, then $$\dfrac{q_1}{q_2}$$ is

Two small balls, each carrying a charge q are suspended by equal insulator string of length $$\dfrac{l}{2}$$ m from the hook of a stand. This arrangement is carried in a satellite in space. The tension in each string will be :

The concept of solid angle is a natural extension of a           angle to             dimensions. 

Calculate the solid angle subtended by an octant of a sphere at the centre of the sphere.

A short electric dipole (which consists of two point charges $$+q \,\, and -q$$) is placed at the centre O and inside a large cube (ABCDEFGH) of length L, as shown in figure. The electric flux, emanating through the cube is:

Find the net flux through the cylinder.

What must be the distance between two equal and opposite point charges (say $$+q$$ and $$-q$$) for the electrostatic force between them to have a magnitude of $$16\ N$$?

Electric flux per unit solid angle is defined as

A charge $$q$$ is placed at the centre of the open end of cylindrical vessel. The flux of electric field through the surface of the vessel is

Two point charges each of charge $$+q$$ are fixed at $$(+a, 0)$$ and $$(-a, 0)$$. Another positive point charge $$q$$ placed at the origin is free to move along x-axis. The charge $$q$$ at the origin in equilibrium will have: