Charged Ring Rolling!

A non-conducting ring of mass mm and radius RR, the charge per unit length λ\lambda is shown in figure. It is then placed on a rough non-conducting horizontal plane. At time t=0t=0, a uniform electric field E=E0i^\vec{E} = E_0 \hat{i} is switched on and the ring starts rolling without sliding. Find the frictional force (f)(f)acting on the ring.

Given - E0=3,R=4m,λ=6 |E_0| = 3 , R = 4m , |\lambda| = 6

Find the value of f2R\sqrt{\frac{f}{2R}}.

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