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The supply voltage to a room is 120 V. The resistance of the lead wires is 6 Ω . A 60 W bulb is already switched on. What is the decrease of voltage across the bulb, when a 240 W heater is switched on in parallel to the bulb ?

1. 13.3 V
2. 10.04 V
3. zero V
4. 2.9 V

Correct answer: 10.04 V

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