The magnetic field at a point on the axis of a long solenoid having 5 turns per cm length when a current of 0.8 A flows through it is
A. `5.024xx10^(-8) Wb//m^(2)`
B. `6.024xx10^(-8)Wb//m^(2)`
C. `7.024xx10^(-8) Wb//m^(2)`
D. `8.024xx10^(-8) Wb//m^(2)`
