10.27: The circuit shown contains a b7l8bhezow*)3i8zy4a) dci l x attery (of emf $V_bat$) with an internal resistance r connected to a rheostat (variable resistor). When the resistance of the rheostat is increased, which of the following statements is true?

  12.39: For the circuit s53.kq 6f mrwnyoj.yv ,hown, all wires have no resistance, the battery has a constant interna6 q 5njry.fvywo. ,3kml resistance of $r = 8.0Ω$ and the two lightbulbs (#1 and #2) are identical, each with resistance R bulb. The variable resistor is initially setto $R = 26.0Ω$ . The switch in the circuit now is closed. To what resistance must the variable resistor be set if bulb #1 is to have the same brightness after the switch is closed as it did with the switch open?