An emf of 5 V is induced in an inductance when the current in it changes at a steady rate from 3 A to 2 A in 1 millisecond. The value of the inductance is
Correct answer: A. 5 mH
- A. 5 mH
- B. 5000 H
- C. 5 H
- D. zero
Explanation
A is the correct answer.The inductance (L) is given by L=−E⋅Δt/ΔI , where E is the induced emf, Δt is the change in time, and ΔI is the change in current. Substituting the given values, we get L=−5⋅10^−3/3-2 =5mH.The negative sign indicates the direction of the induced emf.
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