The supply voltage to a room is $120\; V$. The resistance of the lead wires is $6 \Omega$ . 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?

Question

$\begin{array}{1 1} (1)\;Zero\;Volt \\ (2)\;2.9\;Volt \\ (3)\;13.31\;Volt\\ (4)\;none\;of\;the\;above \end {array}$