What happens to the magnetic field if the coils on a solenoid are wound more tightly?

Question

The strength of the magnetic field is decreased.
The magnetic field remains unaffected.
The strength of the magnetic field is increased.
The direction of the magnetic field is changed.

Answer 1

If the coils on a solenoid are wound more tightly, the strength of the magnetic field is increased. This is because the magnetic field produced by a solenoid is directly proportional to the number of turns of wire in the coil and the current flowing through it. Therefore, increasing the number of turns of wire in the coil will increase the strength of the magnetic field.