Electromagnetic Theory | MCQs

Explanation

A dipole in an electric field behaves in two ways:

• In a uniform electric field:

The two equal and opposite forces cancel each other out.

So, the net force on the dipole is zero.

But a torque is produced that tends to align the dipole moment parallel to the electric field.

• In a non-uniform electric field:

The dipole does experience a net force, and that force is generally not simply parallel to the field.

So the correct answer remains:

(D) None of these — because in a uniform electric field, the net force on a dipole is zero.

Option (C) would be correct only if we were talking about torque direction or net force in a non-uniform field.

Explanation

Maxwell's equations led to the derivation of the speed of electromagnetic waves, including light.

The speed of light (c) is given by C = 1/√μ₀ε₀, where μ₀ is the permeability of free space and ε₀ is the permittivity of free space.

Explanation

Explanation

If the current is into the page and the wire is perpendicular to the page, then the magnetic field will be directed counterclockwise.

Explanation

When the current passing through an inductor is increased by 100 times, the energy stored in the inductor will increase by 10,000 times.

Explanation

Electromagnetic waves are produced due to the flow of charges, specifically both positive and negative charges.