Question

A beam consisting of protons and electrons moving at the same speed goes through a thin region in which there is a magnetic field perpendicular to the beam. The protons and the electrons

Options

• will go undeviated

• will be deviated by the same angle and will not separate

• will be deviated by different angles and hence will separate

•  will be deviated by the same angle but will separate

Answer 1

will be deviated by different angles and hence will separate

Force on a charged particle, F = qVB
For an electron, this force is F = $-$eVB, whereas on a proton this force is F = eVB.
Here, 'e' is the charge of the electron. So, from the above formulas, we can see that electrons and protons will experience equal force but in opposite directions; so they separate out. In other words, we can say that they are deviated by different angles and causes them to separate.