Two questions 3. What happens to the strength of an electromagnet if the current in the wire is increased?
4. Which direction does the magnetic field point in the solenoid sketched here?

awnswer 1 Because the magnetic field is produced by the current, its characteristics can be changed by changing the current. For example, increasing the current increases the strength of the magnetic field.

awnswer 2 Right-hand rule can be used to find the direction of the magnetic field. In this case, point the wrapped fingers (along the coil) in the direction of the conventional current. Then, the thumb will point to the direction of magnetic field within the solenoid.