Questions
One filament takes 10 min to heat a kettle and another takes 15 min. If connected in parallel, they combindly take ______ min to heat the same kettle.
detailed solution
Correct option is A
Lets suppose E energy is required to heat the kettle and P1 and P2 are the power of filament which take 10 min and 15 min respectively to heat the kettle. So P1=E10 and P2=E15. Now both the filaments are connected in parallel to heat the same kettle hence their combined power will be (P1 + P2) but the energy required is still E. If the time they take is t then P1+P2t=E⇒E10+E15t=E ⇒5E30×t=E⇒t=6minTalk to our academic expert!
Similar Questions
Permissible current through a fuse wire of diameter 1 mm is 1A. What should be the radius of a fuse wire, made of same material, whose permissible current is 8A ?
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
free study material
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests
