Physics
How is the working of an electric bell affected, if alternating current be used instead of direct current?
Electro-Magnetism
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Answer
If an a.c. source is used in place of battery, the core of electromagnet will get magnetized, but the polarity at it's ends will change. Since attraction of armature does not depend on the polarity of electromagnet, so the bell will still ring on pressing the switch.
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