Brutus builds the simple electric generator pictured below. An electric current is generated in the wire loop whenever he turns the crank, causing the magnet to spin.
crank
magnet
wire loop
How could Brutus increase the amount of electric current his generator produces?
A.
replace the magnet with a weaker magnet
B.
increase the distance between the magnet and the wire loop
C
replace the wire loop with an unlooped strand of wire
D
increase the rate at which he turns the crank