Published by:
CGP EDU Academic Team
Published on: September 12, 2026
A conducting circular loop is placed in a uniform magnetic field of 0.4 T with its plane perpendicular to the field. Somehow, the radius of the loop starts expanding at a constant rate of 1 mm s -1 . The magnitude of induced emf in the loop at an instant when the radius of the loop is 2 cm will be_______ 
V.
Text Solution
Verified by ExpertsThe correct answer is:
50
(50)
The data given is
B = 0.4T
R = 2 x 10 -2 m
It is given that 
= 10 -3 m s -1
Area of the loop is A = 
R 2
So, 
The flux is,
So, the magnitude of emf is
= 5.028 x 10 -5 V
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A uniform magnetic field exists in a direction perpendicular to the plane of a square loop made of…
A small bar magnet is moved through a coil at constant speed from one end to the other. Which of th…
An infinitely long, straight wire carrying current I, one side opened rectangular loop and a conduc…
A long solenoid of radius carries a time dependent current . A ring of radius is placed coaxiall…
At time magnetic field of Gauss is passing perpendicularly through the area defined by the closed…
Magnetic flux (in weber) in a closed circuit of resistance 20 varies with time t(s) as = 8t 2 - 9…