Question

Which of the following statements is incorrect for a charged particle projected perpendicularly in a magnetic field?

• A. Its kinetic energy remains constant
• B. Its momentum remains constant
• C. Its speed remains constant
• D. Its velocity will change

Answer 1

The correct option is B Its momentum remains constant

As the particle enters perpendicular to the field$\Rightarrow$ CIRCULAR PATH.
$\therefore$Direction of motion of the particle will change but, magnitude of velocity remains constant. So the speed of the particle and kinetic energy will remain constant. Therefore option 'b' is the right answer.