Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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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 - Physics


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


  • 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

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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.

Concept: Force on a Moving Charge in Uniform Magnetic and Electric Fields
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HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 12 Magnetic Field
MCQ | Q 7 | Page 229
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