Assertion
In case of an electric bell, if an 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 an AC source is used in an electric bell, as it changes the polarity, it is continuously magnetized and demagnetized.
The attraction of a strip does not depend on polarity but the strength of attraction surely depends on amplitude which must be high for the bell to properly function.

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Assertion In case of an electric bell, if an 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

Assertion
In case of an electric bell, if an 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