A) 0.8 H
B) 0.4 H
C) 0.2 H
D) 0.1H
Correct Answer: C
Solution :
Key Idea : Emf induced in the coil is equal to negative rate of change of current multiplied by self-inductance. emf induced in the coil is given by \[e=-L\frac{di}{dt}\] ... (i) Gwen, \[\frac{di}{dt}=\frac{2-4}{0.05}=-40\,\,A/s\], \[e=8\,\,V\] Substituting the values in Eq. (i), we get \[8=-L\times (-40)\] or \[L=\frac{8}{40}=0.2\,H\]You need to login to perform this action.
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