Electro Magnetic Induction And Alternating Currents Question 553
Question: An e.m.f. of 100 millivolts is induced in a coil when the current in another nearby coil becomes 10 ampere from zero in 0.1 second. The coefficient of mutual induction between the two coils will be [MP PET 1996; Kerala PMT 2004]
Options:
A) 1 millihenry
B) 10 millihenry
C) 100 millihenry
D) 1000 millihenry
Show Answer
Answer:
Correct Answer: A
Solution:
Induced $ e.m.f.\ \ e=M\frac{di}{dt}\Rightarrow 100\times {{10}^{-3}}=M( \frac{10}{0.1} ) $
$ \therefore \ M={{10}^{-3}}H=1\ mH $
