Q.

A charged particle q is shot towards another charged particle Q which is fixed, with a speed  ν. It approaches Q upto a closest distance r and then returns. If q were given a speed  2ν , the closest distances of approach would be

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya

a

r

b

2r

c

r/2

d

r/4

answer is D.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Charge q will momentarily come to rest at a distance r from charge Q when all it's kinetic energy converted to potential energy i.e.  12mv2=14πε0.qQrTherefore the distance of closest approach is given by  r=qQ4πε0.2mv2⇒r∝1v2
Watch 3-min video & get full concept clarity
Related Blogs
Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
Result Producing online coaching for JEE/NEET of south India
Largest All India Test Series for JEE/NEET
Best Books for IIT JEE
Best Books for NEET
How to Join IIT after 10th
score_test_img

Get Expert Academic Guidance – Connect with a Counselor Today!

Related Blogs
Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
Result Producing online coaching for JEE/NEET of south India
Largest All India Test Series for JEE/NEET
Best Books for IIT JEE
Best Books for NEET
How to Join IIT after 10th
whats app icon
A charged particle q is shot towards another charged particle Q which is fixed, with a speed  ν. It approaches Q upto a closest distance r and then returns. If q were given a speed  2ν , the closest distances of approach would be