a steel bar is coiled with copper wire abd is connected to a battery and a switch. what will happen to tue safety pins brought near it if the switch is in on position? why?
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This lesson describes a simple motor that can be constructed in 15 minutes with inexpensive materials. It involves all the basic principles of motors involving magnetic force, electromagnets, and commutators (rotating switches common in many commercial motors). This device is easy enough and cheap enough to make many copies for the classroom. This lesson works best after students have been introduced to electromagnets, and have seen a diagram of the magnetic field produced by a coil of wire.
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