Some good revision problems 2.0

eureka i am getting that interaction force is not depend on a

let the rod perpendicular to plane be A and the other be B.

Consider a dq charge on B now the field it experience due to A is

E=Kλ₁/x (x is the radial distance of the dq charge from A)

The interaction force =dqE=kxdθλ₁λ₂/x=> force =Kλ1λ2Ï€

nops..

check again

Pity no one is taking inititative to solve the question........

I fear it this thread might be lost...............unlike very succesful previous one......

ya...
it is written ""long "" in question

is the answer \frac{2k\pi \lambda _{1}\lambda _{2}}{a} ?

right answer by karna...

here is next

Q2 A system consists of a thin charged wire ring of radius r and a very long uniformly charged wire oriented along the axis of ring with one ends coinciding with the centre of ring.The total charge on rign is q, and linear charge density of straight wire is λ.Evaluate interaction fore between wire and ring

Ya : )

Conservation of angular momentum
dm*v*r = Iω
I =MR²/2
ω = 2dm*v/M*r