Question

A proton and an alpha particle enters a uniform magnetic field perpendicular with the same speed

Answer 1

HERR IS YOUR ANS

we know that when A positively charged particle like Alpha particle and a Proton enters a magnetic field perpendicularly then it moves on a circular path ..

So both the proton and Alpha particle moves in a circular path radius of the path will be increased with the charge on the particles ..

hope it helps

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