Questions
A conducting circular loop is placed in a uniform magnetic field of induction B tesla with its plane normal to the field. Now, radius of the loop starts shrinking at the rate (dr/dt). Then the induced e.m.f at the instant when the radius is r, is
detailed solution
Correct option is B
If the radius is r at a time t, then the instantaneous magnetic flux ϕ is given byϕ=πr2BNow, induced e.m.f. e is given bye=−dϕdt=−ddtπr2B=−πB2rdrdt=−2πrBdrdtTalk to our academic expert!
Similar Questions
A loop, having area 20cm2, is made of thin copper wire. If is placed in a uniform magnetic field of induction 1.5 Tesla with its plane perpendicular to the field. If area of the loop increases to 30 cm2 in 0.5 second, average emf induced in the loop is
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
