Two point charges, +q and -q, are placed a distance d apart. What is the electric potential at a point midway between them?

A parallel-plate capacitor with air between the plates has a capacitance C. If the space between the plates is filled with a dielectric of dielectric constant K, what is the new capacitance?

An electric dipole is placed in a uniform electric field. In which orientation will the dipole be in stable equilibrium?

What is the electric field inside a charged spherical conductor?

The electric potential due to a point charge varies with distance r as:

If the electric flux entering and leaving an enclosed surface are φ1 and φ2 respectively, the electric charge inside the surface will be:

A capacitor is charged by a battery. The battery is then removed, and a dielectric slab is inserted between the plates. What happens to the charge on the capacitor?

Two identical metal spheres, one with charge +q and the other uncharged, are brought into contact and then separated. What is the charge on each sphere?

The force between two point charges is F. If the distance between the charges is doubled, the new force will be:

What is the SI unit of electric dipole moment?