Question

Magnetic flux passing through a coil is initially 4 × 10 – 4 Wb. It reduces to 10% of itsoriginal value in ‘t’ second. If the e.m.f. induced is 0.72 mV then ‘t’ in second is

Answer 1

Answer:5.5* 10^-5 s

Explanation:

-d¢/dt = emf =(¢f - ¢i)/tf - ti)

0.72 = {[4*10^-4 - (10/100)*4*10^-4] - 4*10^-4} / {t - 0 }

Solving this will give the answer. Hope that helps :)