An electric current in a conductor produces a magnetic field. Electric motors and loudspeakers both use electromagnets. These are made by coiling wire carrying a current around a magnetic core.
Which of these makes an electromagnet stronger?
What controls a relay?
What happens to the magnetic field around an electromagnet when the current is reversed?
Which of these induces a bigger voltage in electromagnetic induction?
What do field line patterns show?
What causes the motor effect?
What is the purpose of a commutator?
What do speakers contain?
What does your first finger point to in the left hand rule?
What advantage does an electromagnet have over a magnet?