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NEET 2006
Exam
NEET
Year
2006
Subject
Physics
Chapter
Electromagnetic Induction

NEET 2006 · Physics · Electromagnetic Induction

Two coils of self inductance 2 mH and 8 mH are placed so close...

Two coils of self inductance 2mH2 \mathrm{mH} and 8 mH\mathrm{mH} are placed so close together that the effective flux in one coil is completely linked with the other. The mutual inductance between these coils is:

Options

  1. A16mH16 \mathrm{mH}
  2. B10mH10 \mathrm{mH}
  3. C6mH6 \mathrm{mH}
  4. D4mH4 \mathrm{mH}

Correct answer

D. 4mH4 \mathrm{mH}

Step-by-step solution

Mutual inductance between coils is M=kI1I2M=12×10−3×8×10−3{x=1}=4×10−3=4mH\begin{aligned}M & =k \sqrt{I_1 I_2}\\ M & =1 \sqrt{2 \times 10^{-3} \times 8 \times 10^{-3}}\{x=1\} \\ & =4 \times10^{-3}=4 \mathrm{mH} \end{aligned}
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