Question

An infinite long cylindrical tube of radius ‘a' moves at constant speed ‘v' along is axis. it carries a net charge per unit length λ, uniformly distributed over its surface. surrounding it, at radius ‘b' is another cylinder, moving with the same velocity but carrying the opposite charge (-λ). find: (a) the energy per unit length stored in the field. (b) the energy per unit time transported by the fields across a plane perpendicular to the cylinders.

Answer 1

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