Homework Answers
Solution-the power supply by the battery increases
After closing the switch,the overall resistance decreases ( due to parallel connection) therefore the current supply by the battery increases or the power supply by the battery increases (P=VI,I=V/R)
We know the brightness of the bulb depends upon the power output across the bulb
After closing the switch current through L increases(l=V/Req), so the brightness of the bulb L increases (P=I^2R)
And due to parallel connection,the potential across N decreases so the power output across the bulb N decreases(P=V^2/R) or the brightness of the bulb N decreases
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