Question 1 Page 231 (MCQ) - Chapter 13 Class 10 - Magnetic Effects of Electric Current

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

Answer

The correct options are 

(c) velocity and (d) momentum

Explanation -  Mass of a proton cannot change.

So, (a) is not correct

Now,

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.

Now, 

Momentum = Mass × Velocity

Since velocity changes, momentum will also change

So, (d) is also correct