Electro Magnetic Induction And Alternating Currents Question 605

Question: A solenoid has an inductance of 60 henrys and a resistance of 30 ohms. If it is connected to a 100 volt battery, how long will it take for the current to reach $ \frac{e-1}{e}\approx 63.2% $ of its final value [MP PET 2000]

Options:

A) 1 second

B) 2 seconds

C) e seconds

D) 2e seconds

Show Answer

Answer:

Correct Answer: B

Solution:

$ t=\tau =\frac{L}{R}=\frac{60}{30}=2,\sec . $



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक