For a short electric dipole, the electric field on the axial line (Eₐ) is twice the electric field on the equatorial line (Eₑ) at the same distance from the center of the dipole. Thus, the correct answer is (a) 2.

The electric field due to a single point charge is spherically symmetric because the field radiates uniformly outward (for a positive charge) or inward (for a negative charge) in all directions from the charge. The magnitude of the field depends ...

The equation q₁ + q₂ = 0 signifies that the two charges are equal in magnitude but opposite in sign, meaning they form an electric dipole. An electric dipole consists of a pair of equal and opposite charges separated by ...

The SI unit of the surface integral of the electric field is Nm²C⁻¹. This follows from Gauss’s law, which states that the surface integral of the electric field over a closed surface equals the enclosed charge divided by the permittivity ...

The correct answer is (b) Quantisation of charge. Charge is always an integral multiple of the elementary charge e because charge exists in discrete packets carried by fundamental particles like electrons and protons. This is known as the quantisation of ...