1can some one help me with this concept ?
Q: Two charges of charge +2q and +q have masses m and 2m respectively.They are kept in a uniform electric field and allowed to move for the same time. Find the ratio of their kinetic energies :
My doubt is to whether to use KE=qV formula [ cant we say that E=Vl for both charges ?..why/whynot ? ] which gives me answer=2:1 OR to use KE = 12mv2 formula which will give me ans=16:1 ??? I'm really confused..[17]
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3 Answers
1we all know that work done = change in kinetic energy
as it is a uniform electric field...V=E.d
now d is not same for both the charges as mass n charge is different
so V will be different...
also u have done a mistake while applying K.E=1/2 mv^2
m is different in both casas
from both methods ratio comes out to be 8:1
1yes rickde..i have written wrong here..but ans given in arihant is 1:16 ,..anyway YOU always help me out..!!!..thanx ..again!!!