A long, nonconducting cylinder (radius = 12 cm) has a charge of uniform density (5.0 nC/m3) distributed throughout its column. Determine the magnitude of the electric field 5.0 cm from the axis of the cylinder.

The value is

Explanation:

From the question we are told that

     The radius of the cylinder is  

     The density of the charge is  

    The position consider is  a =  5.0 cm  =  0.05 m

Gnerally from the magnitude of the magnetic field is mathematically represented as          

Here is the permittivity of free space with value

=>    

=>  

good looking response

b would be the answer