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This is a very important physics discovery.
Our modern lifestyle would not be possible without electric power generation.... and electromagnetic induction is the process by which wind, wave, tidal, HEP, oil, gas, coal, nuclear and biomass energy is changed into electricity.
If a magnet is moved into a coil of wire which is part of a complete circuit a voltage is induced across the ends of the wire - a current is produced (induced) in the wire.
If the magnet is then moved out of the coil, or the other pole of the magnet is moved into the coil, the direction of the induced voltage (current) is reversed.
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Size of the current produced
The size of the induced voltage depends upon the 'rate of cutting of magnetic flux lines'
The direction of the current produced
The direction of the induced current flow can be worked out using Fleming's Right Hand Rule.
Your thumb and first two fingers are held mutually at right angles as shown in the diagram.
Your thuMb represents the direction of the Movement of the wire in the magnetic field.
Your Forefinger represents the direction of the magnetic Field
Your seCond finger represents the direction of the conventional
See here for a page of questions to test your understanding of this.