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Which of the following can create a magnetic field? A. a coil of wire B. an electric current C. hitting a magnet with a hammer D. holding a magnet over iron filings
D
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User: Which of the following can create a magnetic field? A. a coil of wire B. an electric current C. hitting a magnet with a hammer D. holding a magnet over iron filings

Weegy: D
greatromances|Points 840|

User: What is the difference between an electromagnet and a bar magnet? A. A bar magnet's magnetic field is a perfect circle. B. A bar magnet weighs less than an electromagnet. C. An electromagnet's magnetic field can be switched on and off. D. An electromagnet has only one pole while a bar magnet has two.

Weegy: A. A bar magnet's magnetic field is a perfect circle.
Expert answered|andrewpallarca|Points 13584|



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Asked 7/28/2012 11:22:41 AM
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What would MOST LIKELY occur if a plague killed most of the prey organisms within a once-healthy ecosystem? A. The number of consumers would increase. B. The number of scavengers would increase. C. The number of predators would decrease. D. The number of producers would decrease.
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Asked 7/28/2012 3:28:26 PM
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