A ring of radius I caries a charge +q. A test charge -qo is released on its axis at a distance 3R from its centre. How much kinetic energy will be acquired by the test charge when it reaches the centre of the ring ?

see full answer

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

14πε0×qq0R

14πε0×qq02R

14πε0×qq03R

answer is B.

(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

Potential V1, due to a ring is given byV1=14πε0×qR2+r2=14πε0×aR2+3R2(∵r=3R)=14πε0×q2RAt centre V2=14πε0×qR K.E. =q0V2−V1=14πε0qq02R

Watch 3-min video & get full concept clarity