Q. 20

# A (current vs tim

Answer :

We know that induced EMF is given by  thus negative sign indicates that induced EMF () oppose any change increases or decreases of current in the coil

when maximum rate of change of current then back EMF in solenoid is (u) is maximum

this AB occur on the graph

so maximum back EMF will be obtained between 5s < t < 10s for 0 < t < 5s , since back EMF at t = 3s

hence rate of change of current t=3s

if where L = constant

EMF is similarly, we have for other value

for 5s < t < 10s   thus at t = 7s u1 = -3e

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