physics
posted by jaden on .
please help with either or both
1. a charge of 10C is passing in 2 second through a cross sectional area of a conductor. calculate the intensity of magnetic field at a distance of 10 cm from the conductor.
2. An amount of 3X10^20 electrons is passing in a conductor in 2 ms. calculate the electric current.

1) The curent is I = 5 Amps (Coulombs per second)
According to Ampere's law, the magnetic field at a distance of R from the conductor is
B = Uo* I/(2*pi*R)
Make sure R is in meters.
Uo is the permittivity of free space.
2) Same formula for B, but
I = 3*10^20*e/(2*10^3 s)
where 'e' is the electron charge in Coulombs 
thanks