Choose the correct statement among the following:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Electromagnetic waves are not deflected by electric or magnetic fields.
Electromagnetic waves are oscillating electric and magnetic fields travelling together; they carry no charge, and they carry both energy and momentum.
Option (1) Electromagnetic waves are longitudinal waves. — Incorrect. The fields \( \vec{E} \) and \( \vec{B} \) are perpendicular to each other and to the direction of propagation, so the waves are transverse.
Option (2) Electromagnetic waves are not deflected by electric or magnetic fields. — Correct. The waves carry no charge, so external electric and magnetic fields exert no force on them and do not bend their path.
Option (3) Electromagnetic waves have energy but no momentum. — Incorrect. EM waves carry momentum \( p = U/c \), which is why light exerts radiation pressure.
Option (4) Electromagnetic waves are deflected by electric or magnetic fields. — Incorrect. This contradicts Option 2: an uncharged wave is not deflected by electric or magnetic fields.