When the only coil of kettle is switched on, water boils at 12min when the other coil is switched on, time 24 min. When the coil is switched on by connecting the two coils in parallel. When will water break?
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Answer: 9m
Explanation:
Heat produced, H=V2tIR
=>R∞t
Given R1=6Ω
and R2=3Ω
∴R1R2=63
=2Ω
∴R1=2R2
When the coils are connected in series , the net resistance , R1=R1+R2=R2+2R2=3R2
∴R1R2=R2+2R2
=3R2
∴R1R2=t13
t1=3R1R2
=3×3R2R2
=9m
Answer : 9 m
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