A \( 24 \mathrm{~V} \) battery of internal resistance \( 4 \Omega \) is connected to a variable ...

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A \( 24 \mathrm{~V} \) battery of internal resistance \( 4 \Omega \) is connected to a variable resistor. At what value of the current drawn from the battery is the rate of heat produced in the resistor maximum ?
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