Magnets & Electromagnets

Froggy Jumps

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Test your magnetism knowledge

Aaliah Karolia

South Africa

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Magnets & Electromagnets


Froggy Jumps Magnets & ElectromagnetsVersion en ligne Test your magnetism knowledge par Aaliah Karolia 1 What does an electromagnet need to work? a Water b Electricity c Sunlight 2 How can an electromagnet be made stronger? a Use thicker insulation only b Use a non-magnetic core c Increase current and/or number of turns 3 Which material is strongly attracted by magnets? a Plastic b Ferromagnetic materials like iron c Glass 4 Outside a magnet, magnetic field lines run from which pole to which? a In circles around the magnet b From south to north c From north to south 5 If you increase the current in an electromagnet, what happens to its field? a The field reverses direction automatically b The magnetic field becomes stronger c The field becomes weaker 6 What device uses electromagnets to move heavy metal objects? a Solar panel b Transformer c Crane (electromagnetic crane) 7 Which factor does NOT affect electromagnet strength? a Number of turns b Color of the wire c Current 8 What shows the area around a magnet where its force acts? a Electromagnet b Electric circuit c Magnetic field 9 True or false: Like poles repel and opposite poles attract. a True b Only at high temperatures c False 10 Why are electromagnets useful in machines like cranes at scrap yards? a They are colourful b They can be turned on and off c They are permanent magnets