Questions
A flexible wire bent in the form of a circle is placed in a uniform magnetic field perpendicular to the plane of the coil. The radius of the coil changes as shown in figure. The graph of induced emf in the coil is represented by
detailed solution
Correct option is B
In the r - t graph, it is clear that, from a to b, there is no change in radius and hence no change in area and magnetic flux. Same is the situation from c to d. Now, |e|=dϕdt|e|=Bddtπr2|e|=2πrBdrdt From 0-1, r is constant, ∴drdt=0, hence, |e|=0 From 1-2, r=αt, ∴drdt=α, hence, |e|∝r or |e|∝t From 2-3, again r is constant, ∴drdt=0, hence, |e|=0Talk 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.
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