Question

The velocities of two alpha particle A & B entering a uniform magnetic field normally are in the ratio of 4:1. What will be the ratio of their radii?

Answer 1

Here, mass and charge of the charged particle are same. Therefore, the radius of the charged particle in magnetic field is,

r=mvqBSo,r∝v ⇒r1r2=v1v2⇒r1r2=41

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