Q.
Some magnetic flux is changed from a coil of resistance 1$10\ \Omega$. As a result, an induced current is developed in it, which varies with time as shown in figure. The magnitude of change in flux through the coil in weber is
A) 4
B) 8
C) 2
D) 6
Explanation
(c) Here, $R = 10\ \Omega.$ As is known,
$|dq| = \frac{d\phi}{R} = |i\ dt| = area\ under\ i - t$ graphs.
$\therefore\ \ \frac{d\phi}{R} = \ \frac{(4)(0.1)}{2} = 0.2\ $
$d\phi = 0.2\ R = 0.2\ \times 10 = 2\ \ $Wb
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.