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JEE Main 2003
Exam
JEE Main
Year
2003
Subject
Physics
Chapter
Electromagnetic Induction

JEE Main 2003 · Physics · Electromagnetic Induction

When the current changes from +2 ~A to -2 ~A in 0.05 second, an...

When the current changes from +2 A+2 \mathrm{~A} to −2 A-2 \mathrm{~A} in 0.050.05 second, an e.m.f. of 8 V8 \mathrm{~V} is induced in a coil. The coefficient of self-induction of the coil is

Options

  1. A0.2H0.2 \mathrm{H}
  2. B0.4H0.4 \mathrm{H}
  3. C0.8H0.8 \mathrm{H}
  4. D0.1H0.1 \mathrm{H}

Correct answer

D. 0.1H0.1 \mathrm{H}

Step-by-step solution

e=−Ldldt⇒8=(L)2−(−2)0.05⇒L=0.1He=-\mathrm{L} \frac{\mathrm{dl}}{\mathrm{dt}} \Rightarrow 8=(\mathrm{L}) \frac{2-(-2)}{0.05} \Rightarrow \mathrm{L}=0.1 \mathrm{H}
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