Two solenoids stand side-by-side. solenoid b differs from solenoid a in three respects. its total current is 2 times as great, it has 4 times as many coils, and it is 3 times as long. how do the magnetic fields inside the two solenoids compare?

1. solenoid b’s magnetic field is 24 times greater than solenoid a's magnetic field.
2. solenoid a’s magnetic field is 24 times greater than solenoid b's magnetic field.
3. solenoid b’s magnetic field is 6 times greater than solenoid a's magnetic field.
4. solenoid a’s magnetic field is 2.7 times greater than solenoid b's magnetic field.
5. solenoid b’s magnetic field is 2.7 times greater than solenoid a's magnetic field.