Which of the following property of a proton can change while it moves freely in a magnetic field? (there may be more than one correct answer.)

(a) Mass                (b) Speed

(c) velocity             (d) momentum



The correct options are 

(c) velocity and (d) momentum


Explanation -  Mass of a proton cannot change.

So, (a) is not correct



When a proton enters a magnetic field, it starts moving in a circular motion.

In circular motion, speed is constant but velocity keeps changing.

So, (b) is not correct.


But, (c) is correct.



Momentum = Mass × Velocity

Since velocity changes, momentum will also change

So, (d) is also correct

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  1. Class 10
  2. Chapter 13 Class 10 - Magnetic Effects of Electric Current

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.