Question

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.

Answer 1

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

Answer 2

thanks