Along, thin straight wire with linear charge density λ runs down the center of a thin, hollow metal cylinder of radius r. the cylinder has a net linear charge density 2λ. assume λ is positive. find expressions for the magnitude of the electric field strength inside the cylinder, r

Explanation:

Given that

For straight wire

Charge density= λ

For hollow metal cylinder

Charge density=2 λ

We know that electric filed for wire given as

Now the electric filed due to hollow metal cylinder

Now  by considering the Gaussian surface r<R then only electric fild due to wire will present.So

At r<R

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )