A hollow cylinder having infinite length and carrying unifrom current per unit length `lamda` along the circumference as shown Magnetic field inside the cylinder is
.

Options

A. `(mu_(0)lamda)/2`
B. `mu_(0)lamda`
C. `2mu_(0)lamda`
D. None of these

Answer

B

Explanation

Assume ampere loop ABCD from Ampere’s law
`intvecB.dvecl=mu_(0)i_(n),Bl=mu_(0)lamdal`
`B=mu_(0)lamda`