When the current in a coil changes from 2A to 4A in 0.05 sec, the e.m.f. developed in the coil is 8V. The coefficent of self induction of the coil is
When the current in a coil changes from 2A to 4A in 0.05 sec, the e.m.f. developed in the coil is 8V. The coefficent of self induction of the coil is
A. 0.1 H
B. 0.2 H
C. 0.4 H
D. 0.3 H
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Correct Answer - B
`e = L(dI)/(dt) :. L = (edt)/(dI)`
`:. L = 8 xx 5/100 xx 1/2 = 0.2H`.
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