Electro Magnetic Induction And Alternating Currents Question 327

Question: A coil of inductance 8.4 mH and resistance 6 W is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time [IIT-JEE (Screening) 1999; UPSEAT 2003]

Options:

A) 500 sec

B) 20 sec

C) 35 milli sec

D) 1 milli sec

Show Answer

Answer:

Correct Answer: D

Solution:

Peak current in the circuits $ i_{0}=\frac{12}{6}=2A $

Current decreases from 2A to 1A i.e., becomes half in time

$ t=0.693\frac{L}{R}=0.693\times \frac{8.4\times {{10}^{-3}}}{6}=1milli,sec. $



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक