Figure shows two large cylindrical shells having uniform linear charge densities +λ and – λ. Radius of inner cylinder is ‘a’ and that of outer cylinder is ‘b’. A charged particle of mass m, charge q revolves in a circle of radius r. Then, its speed ‘v’ is: (Neglect gravity and assume the radii of both the cylinders to be very small in comparison to their length.)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Using Gauss's law for Gaussian surface shown in figure.
; E. 2πr λ = 
∴ E = 
For circular motion. o
qE = 
∴ V = 
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