A student investigates the magnetic fields produced by electromagnets and permanent magnets.
Describe how the student could investigate the shape and direction of the magnetic field around a current-carrying solenoid.
The student places two wide, flat magnetic poles opposite each other to create a magnetic field. The diagram below shows the magnetic field lines in the region between these poles.
Explain how the diagram shows that the magnetic field is uniform.
The student connects the ends of a rectangular loop of wire to a sensitive microammeter. They then move the loop horizontally into the magnetic field between the poles.
Explain why the microammeter displays a current as the loop enters the magnetic field.
State two ways that the student could increase the size of the induced current while using the same loop of wire.
