Plz solve this sum

Asked by  | 8th Feb, 2010, 02:06: PM

Expert Answer:

Dear Student

Say Q amount of heat energy is required to start boiling  the water.

Coil 1 gives   Q/10  heat  enrgy per minute

cOIL 2 gives Q/15   heat  enrgy per minute

If both the coils qorking together 

they can give  Q/10+Q/15 =Q/6 heat  enrgy per minute

So it takes 6 minutes to start boiling the water with both the coils on together.






Answered by  | 8th Feb, 2010, 02:37: PM

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