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How can a permanent magnet be demagnetized? 1. Cut the magnet in half. 2. Heat the magnet up. 3. Strike the magnet with a heavy blow. 4. both the second and third choices above.
4. both the second and third choices above.
Expert answered|Cluvsny|Points 230|
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Asked 5/7/2012 8:02:50 PM
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If you wanted to check to see if a set of Christmas lights were connected in series or parallel how could you do this?
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The output voltage and current of a transformer are determined by the what? 1. number of turns in the primary and secondary coils. 2. strength of the DC current in the primary coil. 3. ferromagnetic material of the rings connecting the coils. 4. direction of the current in the primary coil.
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Asked 5/1/2012 12:05:21 PM
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A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called a(an) what? 1. transformer. 2. generator. 3. electromagnet. 4. current meter.
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Expert Answered
Updated 5/1/2012 12:35:14 PM
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A device that changes mechanical energy to electrical energy by rotating a coil of wire through a magnetic field is called 2. generator.
Added 5/1/2012 12:35:14 PM
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