1) When two like poles of a magnet are close they ________ each other. a) attract b) repel 2) When the north pole of a magnet is close to iron it will _________ a) Attract b) Repel 3) When the south pole of a magnet is close to iron it will ________ a) Attract b) Repel 4) How do you turn a copper wire into a magnet? a) rub it with zinc b) use an insulator c) increase the resistance d) reverse the polarity e) put a current through it 5) Where is the magnetic field the strongest on a bar magnet? a) where the lines cross b) in the middle c) at the South pole d) at the north pole e) where the lines are closest 6) How do you turn a wire into a SOLENOID? a) charge it b) coil it up c) voltage it d) heat it e) spin it 7) How do you turn a solenoid into an electromagnet? a) add an iron core b) add a steel core c) add a copper core d) add an apple core 8) What is a solenoid? a) a robot b) a machine c) a permanent magnet d) an electromagnet e) a coil of wire 9) What shape is the field around a solenoid? a) a beetle b) a butterfly c) a flower d) an ant e) a fish 10) Which of these would not increase the strength of magnetic field of a solenoid? a) add more coils b) add an iron core c) add more resistance d) add more current 11) In what direction do magnetic field lines point? a) from N to S b) from S to N c) in all directions 12) Metals are a) Good conductors b) Bad conductors c) Good insulators 13) Electromagnets are a) Permanent b) Temporary c) Useful d) Of no use 14) Magnetic materials a) Iron b) Copper c) Aluminum d) Cobalt e) Nickel f) Gold

Electromagnetism

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