An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then

the path of proton shall be more curved than that of electron.

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the path of proton shall be less curved than that of electron

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both are equally curved

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path of both will be straight line.

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Solution

The correct option is A the path of proton shall be more curved than that of electron.
Since momentum are same and masses of electron and proton are different , So they will attains different velocities and hence experience different forces. But radius of circular path is depending on momentum so both will be moving on trajectory path.
$∴$ answer is A

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