# Faraday disk/ how is the magnetic flux changing?

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1. May 29, 2015

### John K

i can not seem to figure out how is the magnetic flux is changing and thus the current is induced , "A "is constant (same disk is spinning ) and "B" is constant and does not change , so how is the current induced ?
and more specifically how is the change of magnetic flux is happening ?
thanks for help .

2. May 29, 2015

### Simon Bridge

Welcome to PF;
Who is claiming that the magnetic field must change?
What happens to a charge moving through a magnetic field?