Question

Using 3 – 4 sentences, explain, in your own words, two ways you could cause an electrical current using only a wire and a horseshoe magnet.

Answer 1

What do you know about Faraday's law of induction?

Answer 2

When you change the magnetic flux of a surface inside a conductor (i.e. the amount of magnetic field that passes through some area inside the loop of wire) the wire will create an "induced emf" to counteract the change in flux, because an electric current will induce a magnetic field. Basically, if the flux inside the coil of word decreases, the induced emf will induce a magnetic field that counteracts the change in flux.

Faraday's law demonstrates this. The negative time derivative of flux (B*A) is equal to the induced emf.