Rank the magnetic field of the solenoids described from weakest (1) to strongest (4).
a. Length: 20 cm
Number of Turns: 1000
Current: 1.5 A
b. Length: 15 cm
Number of Turns: 180
Current: 5.0 A
c. Length: 25 cm
Number of Turns: 200
Current: 6.0 A
d. Length: 12 cm
Number of Turns: 300
Current: 2.0 A