ElectrostaticsHard
Question
The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be
Options
A.
B.
C.
D.
Solution
Induced emf, e = - L
For 0 ≤ t ≤
i-t graph is straight line with positive constant slope.
∴
= constant⇒ e = - ve and constant 0 ≤ t ≤
For
i is constant ∴
= 0⇒ e = 0
For
i-t graph is straight line with negative constant slope.
∴
= constant⇒ e = + ve and constant
For
≤ t ≤ T i is zero ∴
= 0⇒ e = 0
≤ t ≤ T From this analysis, the variation of induced emf with time as shown in the figure bellow
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