There are `50` turns of a wire in every `cm` langth of a long solenoid. If `4` ampere current is flowing in the solenoid, the approximate value of magnetic field along its axis at an internal point and at one end will be respectively

Options

A. `12.6 xx 10^(-3)Wb//m^(2), 6.3 xx 10^(-3)Wb//m^(2)`
B. `12.6 xx 10^(-3) Wb//m^(2), 25.1 xx 10^(-3)Wb//m^(2)`
C. `25.1 xx 10^(-3) Wb//m^(2), 12.6 xx 10^(-3)Wb//m^(2)`
D. `25.1 xx 10^(-5) Wb//m^(2), 12.6 xx 10^(-5)Wb//m^(2)`

Answer

C