Electro Magnetic Induction And Alternating Currents Question 562
Question: A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is [AMU 1995]
Options:
A) 3.5 sec
B) 4.0 sec
C) 4.5 sec
D) 5.0 sec
Show Answer
Answer:
Correct Answer: D
Solution:
$ t=\tau =\frac{L}{R}=\frac{2.5}{0.5}=5\ \sec $
