A student wishes to make the magnetic force exerted by the electromagnet shown below greater.
image e0200808b8fa436fae6f573f2546fa05
Which procedure step could the student follow to accomplish this goal?
A.
increase the length of wire at location 1
B.
open the switch at location 2
C.
add more batteries in series at location 3
D.
reduce the number of wire turns at location 4