wiz-icon
MyQuestionIcon
MyQuestionIcon
3
You visited us 3 times! Enjoying our articles? Unlock Full Access!
Question

Cathode rays gain K.E. when they are accelerated by an electric field. If cathode rays are subjected to the action of magnetic field, then their

A
Energy increases
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Momentum increases
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Potential energy increases
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
Energy and momentum remain unaffected
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is D Energy and momentum remain unaffected

Since the magnetic force acting on a moving electric charge is perpendicular to the motion of the charge - the WORK done on the moving charge is zero, meaning that its kinetic energy stays constant.Since the DIRECTION of the charge’s motion changes, we know that the momentum changes its direction also (but not its magnitude.)


flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
The Electric Field
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon