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If a freely-suspended magnet is allowed to come to rest, it will always point in a _________ direction.
North - South
When Magnet A is brought close to Magnet B, the two of them repel each other. What is a possible reason for this?
Both their like poles are facing each other
The magnetic force becomes stronger when it attracts more iron nails. (True/False)
False
A bar magnet can attract all kinds of metal. (True/False)
False
Magnetic force can only act at its poles. (True/False)
False
Magnetism can pass through non-magnetic materials. (True/False)
True
A magnet can be demagnetized by dropping it on the floor repeatedly. (True/False)
True
A magnet can be demagnetized by placing it under the sun for an hour. (True/False)
False
A magnet can be demagnetized by heating it over an open flame. (True/False)
True
A magnet can be demagnetized by soaking it in water for few hours. (True/False)
False
Keith had four nails of the same size but made of different materials (Plastic/Copper/Steel/Silver). She stroked each nail thrity times in the same direction with the same magnet. Which nail would attract some iron pins?
Steel nail
I can check whether an electromagnet is working by putting some paperclips near it. (True/False)
True
I can check whether an electromagnet is working by checking to see whether it conducts heat easily. (True/False)
False
I can check whether an electromagnet is working by checking if it can repel insulators. (True/False)
False
Magnets are useful to keep the door of a refrigerator shut. (True/False)
True
Magnets are useful to stick our memo onto a magnetic notice board. (True/False)
True
