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

# 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

MCQ

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

#### Solution

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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#### APPEARS IN

HC Verma Class 11, Class 12 Concepts of Physics Vol. 2
Chapter 12 Magnetic Field
MCQ | Q 7 | Page 229