In case of a electric bell, how is the frequency of its ringing can be altered?
I NEED THE ANSWER NOW.

Dear Student,
The frequency of the sound from the bell depends on the electromagnetic force or electromagnet strength.  It is dependent on the current.  The current depends on the battery.  Higher the potential of the battery is, higher the current is.  Higher will be the frequency.  It also depends (directly proportional) on the number of windings and around electromagnet and on the material 

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