Which one of the following is correct?

The correct answer is Option (4) → Photons are not deflected by both electric and magnetic fields.

A photon is a quantum of electromagnetic radiation and carries no electric charge. An electric field exerts a force qE and a magnetic field a force \( q\vec{v} \times \vec{B} \) only on charged particles, so with q = 0 both forces are zero and photons are not deflected by either field.

This is one of the ways in which photons differ from electrons: a beam of electrons bends in electric and magnetic fields, while light passes straight through them.

NCERT (2026-27):
Particle Nature of Light: The Photon – “… (iv) Photons are electrically neutral and are not deflected by electric and magnetic fields.”