1) How can you make a magnetic field around a wire? a) Induce a field with a magnet b) Pass an electric current through the wire c) Apply a force to the wire (eg. bending it) d) High voltage input 2) Where is the magnetic field of a wire strongest? a) Closest to the wire b) Further away from the wire c) Double the wire diameter width away 3) How can you increase the strength of the field around a wire a) Use a magnetic core (like iron) b) Reduce the current c) Decrease the number of turns in the coil d) Use a non-magnetic core (like wood) e) Increase the current f) Increase the number of turns in the coil 4) What is a solenoid? a) The name for a magnetic field inducing current b) A solar powered electromagnet c) The magnetic core of an electromagnet d) The coil of wire used as an electromagnet 5) Why is an electromagnet called a temporary magnet? a) It can be turned on and off, producing a magnetic field only when current flows through the coil b) It only lasts for a short period of time c) It needs to be regularly recharged 6) Give two ways of increasing the strength of the motor effect a) Decreasing the current b) Increasing the strength of the magnetic field c) Increasing fuel d) Adding a wire between the two magnets e) Increasing the current 7) What does Fleming’s left-hand rule help you to work out? a) Direction of the magnetic field b) Direction of conventional current c) Direction of the force experienced 8) What does magnetic flux density measure? a) The velocity of a magnetic field b) The force applied to a particle by a magnetic field c) The force difference of a magnetic field in alternating current 9) What are the units for magnetic flux density? a) Joules b) Tesla c) Newtons d) Newtons per second 10) What is a transformer? a) Transformers use electromagnetic induction to change the current of fixed voltages b) Transformers use electromagnetic induction to change the voltage of direct currents c) Transformers use electromagnetic induction to change the voltage of alternating currents 11) What are the two poles of a magnet? a) North and South b) East and West c) Top and Bottom d) Left and Right 12) What does a compass needle point to? a) Magnetic North b) True South c) Geographic East d) Magnetic West 13) What happens when like poles of magnets are near each other? a) They repel b) They attract c) They neutralize d) They rotate 14) Which material is commonly magnetic? a) Iron b) Plastic c) Wood d) Glass 15) What is the Earth's magnetic field similar to? a) A bar magnet b) A compass c) A battery d) A light bulb

Magnetism

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