1) What is electromagnetism? a) how electric currents produce magnetic fields and how changing magnetic fields can induce electric currents. b) A method for measuring electricity 2) What creates a magnetic field around a wire? a) n electric current flowing through the wire. b) Heat travelling through the wire 3) What is an electromagnet? a) A temporary magnet made by passing electric current through a coil of wire. b) A magnet made from melted plastic 4) How can you make an electromagnet stronger? a) Add more turns (loops) to the coil or increase the electric current. b) Make the wire shorter 5) What material is usually placed inside a coil to make a strong electromagnet? a) Soft iron (iron core). b) Glass 6) What happens to an electromagnet when the current is switched off? a) It loses its magnetism. b) It becomes a permanent magnet 7) What is a solenoid? a) A coil of wire with many turns that produces a magnetic field when current flows b) A battery that never runs out 8) Give one example of where electromagnets are used. a) electric bells, motors, cranes, speakers. b) In soccer balls 9) Why is an electromagnet useful compared to a permanent magnet? a) It can be turned ON and OFF and its strength can be changed. b) It changes colour when used 10) What does increasing the current in the coil do to the magnetic field? a) It makes the magnetic field stronger. b) Makes the magnet explode

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