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 $



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