Unlike an electromagnet, a permanent magnetA does not need electricity to work.B cannot lift heavy objects and release them.C can easily increase or decrease its magnetic field.D can shut down its magnetic field with the flip of a switch.
Question
Unlike an electromagnet, a permanent magnetA does not need electricity to work.B cannot lift heavy objects and release them.C can easily increase or decrease its magnetic field.D can shut down its magnetic field with the flip of a switch.
Solution 1
The correct answer is A: Unlike an electromagnet, a permanent magnet does not need electricity to work. Permanent magnets produce a magnetic field without the need for any external source of power, unlike electromagnets which require an electric current to generate their magnetic field.
Solution 2
The correct answer is A: Unlike an electromagnet, a permanent magnet does not need electricity to work. Permanent magnets produce a magnetic field without the need for any external source of power, unlike electromagnets which require an electric current to generate their magnetic field.
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