oh thank you now i got it the lorentz field is always in the radial direction out of the disk so the positive charge is on b..
and yes that is the voltage between A and B but i also got it now from Ohm`s law
Hi im having a difficulty understanding how to write the circuit equation inside a disk which rotates in magnetic field.
the disk is made of conductor material.
the resistance of the disk is: r
the answer is: ir=emf+v(a)-v(b)
if someone could explain it would be great!
and how do i know where is...