EVERYDAY SCIENCE - MAGNETS

Question 2

Bob watched a superhero movie recently and it inspired him to want to become a hero to help others in need. When Ace had lost his keys in the house, Bob wanted to apply what he had learnt about electromagnets from his science lessons to find the lost item. He dressed up and gathered a battery and an iron rod to make an electromagnet. Equipping himself with the electromagnet, Bob would transform to become the hero MagneBob.

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Answer 1

Fill in the blanks with the keywords provided below.
[coil] • [non-magnetic] • [increase] • [steel] • [batteries] • [connect] • [wire] • [aluminium]

a) MagneBob has a battery and an iron rod. Which component of the electromagnet was missing?

Answer:

MagneBob needs a long piece of to complete the electromagnet. He would have to the wire around the iron rod many times, then the ends of the wire to the battery so that electricity will flow through the wire.


b) MagneBob was unable to find Ace’s keys even after searching the entire house with his electromagnet. Describe two ways that Bob could increase the strength of his electromagnet to become a more effective hero.

Answer:

Bob could the number of coils of wire around the iron rod. Additionally, Bob could increase the number of connected to the electromagnet.
When the electromagnet is stronger, it is able to attract a magnetic object from a greater distance.


c) MagneBob saw that Ace’s keys were underneath a sofa that was too heavy to push away. MagneBob made use of his new power of attraction to attract the keys.
Unfortunately, MagneBob was unable to retrieve the keys. Give a reason to explain why the electromagnet was unable to attract the keys.

Answer:

The electromagnet could not attract the keys because they were not made of magnetic materials such as iron or . Instead the keys were made of a material such as .




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“Magnetism is widely used in amusement park rides! Magnets become your brakes!”