Question

a beam of alpha particles and protons moving with same velocity enter a uniform magnetic field at right angles to field lines.the particles describe circular path what is ratio of radii of circular path

Answer 1

Answer:

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Explanation:

Alpha particles will be helium nucleus of charge 2e and mass 4u

Proton will be hydrogen of charge 1e and mass 1u

Radius of circle of charged particle in magnetic field will be r=mv/qb

By lorenzo force ,

Radius = Momentum /charge *magnetic field

We know that radius is inversely proportional to charge

So radius of alpha particles will be half of radius of proton

Hence radiii=1:2