page 15 21. A circuit is set up as shown. 12 V 4.0 Ω A The resistance of the variable resistor is set to 6.0 Ω. The lost volts due to the internal resistance of the battery is: A 1.2 V B 4.8 V C 6.0 V D 7.2 V E 8.0 V. 22. A circuit is set up as shown. 12 V 220 µF V The battery has negligible internal resistance. The capacitor is initially uncharged. The switch is now closed. When the reading on the voltmeter is 7.0 V, the charge stored on the capacitor is: A 3.1 × 10−5 C B 4.4 × 10−5 C C 1.1 × 10−3 C D 1.5 × 10−3 C E 2.6 × 10−3 C. [Turn over