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Questions  

An electron and a proton have equal kinetic energies. They enter in a magnetic field perpendicularly. Then

a
Both will follow a circular path with same radius
b
Both will follow a helical path
c
Both will follow a parabolic path
d
None of the above

detailed solution

Correct option is D

Particles are entering perpendicularly, hence they will describe circular path. Since their masses are different so they will describe path of different radii.

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