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The music system draws a current of 400 ...

The music system draws a current of 400 mA when connected to a 12 V battery.
The music system if left playing for several hours and finally the battery voltage drops and the music system stops playing when the current drops to 320 mA. At what battery voltage does the music system stop playing ?

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Verified by Experts

`V = IR implies V = ( 320 xx 10^(-3)) xx 30 = 9.6 V`
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