When photons travel through crossed electric and magnetic field, perpendicular to both the fields then they are?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → not deflected
A photon carries no electric charge, so neither an electric field (force \( q\vec{E} \)) nor a magnetic field (force \( q\vec{v}\times\vec{B} \)) exerts any force on it. With \( q = 0 \) both forces vanish and the photons travel straight.
NCERT (2026-27):
Particle Nature of Light: The Photon – “… (iv) Photons are electrically neutral and are not deflected by electric and magnetic fields.”