Asked by london
Two kinds of magnets are shown below.
Which of the following best describes a difference between the two magnets?
A.
Magnet 2 can attract more kinds of material than magnet 1 can attract.
B.
Magnet 2 can attract or repel objects, but magnet 1 can only attract objects.
C.
Magnet 2 creates a continuous magnetic field, but magnet 1 only creates a temporary magnetic field.
D.
Magnet 2 can be switched on and off more easily than magnet 1.
All Answers 1
Answered by
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D.
Magnet 2 is an electromagnet (a coil with current) and Magnet 1 is a permanent magnet. An electromagnet’s field can be turned on and off easily by switching the current, whereas a permanent magnet’s field is always present.
(A) is false — neither type attracts more kinds of material (both mainly affect ferromagnetic materials).
(B) is false — both kinds can attract or repel depending on pole orientation.
(C) is reversed — the permanent magnet makes a continuous field; the electromagnet’s field exists only when current flows.
Magnet 2 is an electromagnet (a coil with current) and Magnet 1 is a permanent magnet. An electromagnet’s field can be turned on and off easily by switching the current, whereas a permanent magnet’s field is always present.
(A) is false — neither type attracts more kinds of material (both mainly affect ferromagnetic materials).
(B) is false — both kinds can attract or repel depending on pole orientation.
(C) is reversed — the permanent magnet makes a continuous field; the electromagnet’s field exists only when current flows.
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