JEE Main 2025 (2 Apr, Shift 1) Physics Q44: A…

Question

A monochromatic light is incident on a metallic plate having work function $\phi$. An electron, emitted normally to the plate from a point A with maximum kinetic energy, enters a constant magnetic field, perpendicular to the initial velocity of electron. The electron passes through a curve and hits back the plate at a point B. The distance between A and B is :
(Given : The magnitude of charge of an electron is e and mass is m, h is Planck's constant and c is velocity of light. Take the magnetic field exists throughout the path of electron)

Accepted Answer

Option 1: $\sqrt{8m\left(\frac{hc}{\lambda}-\phi\right)}/eB$

Answer

$\sqrt{8m\left(\frac{hc}{\lambda}-\phi\right)}/eB$

Answer

$\sqrt{2m\left(\frac{hc}{\lambda}-\phi\right)}/eB$

Answer

$\sqrt{m\left(\frac{hc}{\lambda}-\phi\right)}/eB$

Answer

$2\sqrt{m\left(\frac{hc}{\lambda}-\phi\right)}/eB$

JEE Main 2 April 2025, Shift 1, Physics Q44

Same idea in other shifts