Magnetic Field of a Wire

What significant discovery did Hans Christian Ørsted make regarding electricity and magnetism?

• Stationary charges produce a magnetic field.

• Magnetic fields can be created by moving charges.

• Magnetic fields only exist around permanent magnets.

• Electric fields and magnetic fields are entirely unrelated.

Which factor directly influences the magnitude of the magnetic field generated by a straight current-carrying wire?

• The material of the wire.

• The length of the wire.

• The amount of current flowing through the wire.

• The temperature of the wire.

When applying the right-hand rule to determine the direction of the magnetic field around a straight current-carrying wire, what does the thumb represent?

• The direction of the magnetic field.

• The direction of the force on the wire.

• The direction of the current.

• The radius from the wire.

What type of force occurs between two parallel wires when they carry electric currents in the same direction?

• They repel each other.

• They attract each other.

• They experience no force.

• They generate an electric field that cancels out.