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GUJCET · Physics · Electromagnetic Induction
What is the self inductance of a coil which produces, self induced emf of 5 V , when the current changes from 3 A to 2 A in one milli second?
- A 5 mH
- B 5 H
- C 50 H
- D 5000 H
Answer & Solution
Correct Answer
(A) 5 mH
Step-by-step Solution
Detailed explanation
A
\(\begin{array}{l}\varepsilon=- L \frac{d I }{d t} \\ 5=\frac{- L (2-3)}{1 \times 10^{-3}}\end{array}\)
\(\begin{aligned} L & =\frac{5 \times 1 \times 10^{-3}}{1} \\ L & =5 \times 10^{-3} H \\ & \approx 5 mH \end{aligned}\)
\(\begin{array}{l}\varepsilon=- L \frac{d I }{d t} \\ 5=\frac{- L (2-3)}{1 \times 10^{-3}}\end{array}\)
\(\begin{aligned} L & =\frac{5 \times 1 \times 10^{-3}}{1} \\ L & =5 \times 10^{-3} H \\ & \approx 5 mH \end{aligned}\)
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