A particle enters normally into a uniform magnetic strip with magnetic radius r. What is the critical strip width above which the particle cannot reach the far boundary and instead returns to the entrance boundary after a semicircle?

Physics · Magnetic effect of current · motion of charge particle in magnetic field

JEE MainsNEET

A particle enters normally into a uniform magnetic strip with magnetic radius r. What is the critical strip width above which the particle cannot reach the far boundary and instead returns to the entrance boundary after a semicircle?

Options