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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 the positive charge and negative charge

thanks!

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 the positive charge and negative charge

thanks!

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