wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A conducting circular loop is placed in a uniform magnetic field B= 40 mT with its plane perpendicular to the field. If the radius of the loop starts shrinking at a constant rate of 2 mms1, then the induced emf in the loop at an instant when its radius is 1.0 cm is

A
0.1πμV
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
0.2πμV
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
1.0πμV
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
1.6πμV
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution

The correct option is C 1.6πμV
ϕ=Bπr2

emf=dϕdt=2Bπrdrdt

emf at r=1cm=2×0.04π×0.01×0.002
=1.6πμV

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Motional EMF
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon