why will the charged particle move in a straight line when projected from rest in a region of steady and uniform elec and mag fields which are parallel to each other?

3 years ago


Answers : (2)


magnetic force on particle = qvBsin@


when velocity is parallel to magnetic then @ = 0 or 180,

then magnetic force is qvBsin0 = 0

electric force is F = qE


net force  =  electric force+ magnetic force = qE

net force is electric force along the direction of motion...so the motion of charged particle is straight line acclerated motion...

3 years ago

As the charge is at rest, it will accelerate by elctric field along the line of electric field ( magnetic field only change direction of charge).

Now as the magnectic field is parallal to electric field, so charge will move along magnetic field.

From the forluma, Fm=qvBsinθ as the θ=0 Fm=0, hence no net force magnetic force acting on it (and hence it will not change its direction)

From above result, as only eletric force acting on it, charge particle will move in a straight line (along the line of electric field due to eletric force)

3 years ago

Post Your Answer

More Questions On IIT JEE Entrance Exam

Ask Experts

Have any Question? Ask Experts
Post Question
Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details
Hey, I am from Bangalore, I am in a bad situation now, the problem is have just done my 10 std in 2010, and I quit school for good reasons. Now I have decieded to resume my sudies and do my...
For JEE 2014 the eligibility criteria for admission, in context of age was: Born on or after 1 st October 1989 . So for JEE 2015 you can have the idea about the exact date, i.e., Born on or...
Aziz Alam one month ago
I want to learn calculus from basics so which book should i use to master in calculus???
Hello Anup, If you want to learn the calculus from basics, then you should follow Arihant – Differential Calculus Arihant – Integral Calculus IA Maron All the three books are...
Jitender Singh one month ago
Will IITs and/or ISM carry out spot counselling in 2014.
Spot counselling is for NITs, IIITs 7 other institutes.IITs & ISM don not participate in Spot Counselling. Thanks & Regards Aziz Alam IIT Roorkee askIITians
Aziz Alam one month ago
sir my ipu cet rank is 3632 odgen and my cbse %is 92.2% i am going to join a ipu college bt i am damm want to get iit delhi is it a right decision for me to be a partial dropper as i have...
The decision is correct but tough. Keep this mind that you have to take both into consideration, i.e. IIT JEE preparations and academics at ipu college.If you think you can manage these two...
Aziz Alam 22 days ago
(a) 5 (b) 6 (c) 7 (d) 8
Hi, Please ask your question again... its not clear .
Vijay Luxmi Askiitiansexpert 4 years ago
I got 117 marks in jee mains and 94.1% in intermediate . I am under SC category .which rank can i expect to have?
with 117 marks in jee mains and 94.1% in intermediate . under SC category,Your category rank will be very good, you can get good colleges under sc category.
Sher Mohammad one month ago
View all Questions »