Assertion :In case of electric bell if AC power supply is used then its amplitude of the supply must be sufficiently high. Reason: Due to AC supply there will be continuous magnetization and demagnetization of the magnet

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
If AC source is used in electric bell, As it changes the polarity, it continuous by magnetizes and demagnetizes .
Though attraction of strip does not depend on polarity but the strength of attraction surely depend on amplitude which must be high.

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