Electro Magnetic Induction And Alternating Currents Question 386
Question: The magnetic flux linked with a coil, in webers, is given by the equations $ \varphi =3t^{2}+4t+9 $ . Then the magnitude of induced e.m.f. at t = 2 second will be [KCET 2000; CPMT 2003; MP PET 2005]
Options:
A) 2 volt
B) 4 volt
C) 8 volt
D) 16 volt
Show Answer
Answer:
Correct Answer: D
Solution:
$ e=-\frac{d\varphi }{dt}=-\frac{d}{dt}( 3t^{2}+4t+9 )=-( 6t+4 ) $
$ e=-[ 6(2)+4 ]=-16\Rightarrow ,|e|,=16\ volt $
