question_answer

Electric charge is uniformly distributed along a long straight wire of radius 1mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is                                             [MP PET 2001]

A)           

B)           

C)           

D)           

Correct Answer: B

Solution :

           Charge enclosed by cylindrical surface (length 100 cm) is By applying Gauss's law