Question:

An electron c penetrates through a thin plate A and enters the electric field region between parallel plates A and B. It gets slowed down Three other particles-proton (p), alpha particles $(\alpha)$ and beta particles $(\beta^-)$ - similarly penetrate through either plate A or plate B as shown. The correct statement as regards the speed of the particles is

Updated On: Jun 23, 2023
  • only speed of p increases
  • speeds of both $\alpha$ and $\beta -$ increases
  • speeds of both $p$ and $\beta- $ increases
  • speed of only $\alpha $ increases
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The Correct Option is C

Solution and Explanation

Here electric field between plates A and B is directed from A to B.
Proton has positive charge and is moving along direction of electric field, hence its speed increases.
$\beta$ has negative charge and is moving opposite to the direction of electric field, hence its speed increases.
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Concepts Used:

Electric charges and field

What is Electric Charge

It is the property of subatomic particles that experiences a force when put in an electric and magnetic field.

What is Electric Field

It is a property associated with each point in space when charge is present in any form. The magnitude and direction of the electric field are expressed by E, called electric field strength or electric field intensity.

Electric charges are of two types: Positive and Negative. It is commonly carried by charge carriers protons and electrons.

Properties of Electric Charge

Various properties of charge include the following :-

Types of electric charge

Two kinds of electric charges are there :-

Negative Charge - When an object has a negative charge it means that it has more electrons than protons.

Positive Charge - When an object has a positive charge it means that it has more protons than electrons.

When there is an identical number of positive and negative charges, the negative and positive charges would cancel out each other and the object would become neutral.