A proton projected with a velocity v describes a circle of radius r in a uniform magnetic field. With what velocity should an alpha-particle be projected so that it describes a circle of the same radius r in the same magnetic field?
Charge of -particle = 2e, mass of -particle = 4m, where e is charge of a proton and m its mass.
. Therefore, r will be same if is the same for both particles, i.e.
Which gives .
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