Answer:
As per the data given in
the question, magnetic field due to current in solenoid S, B =
Magnetic
flux linked with the smaller coil due to this field is
= NBA, where A = area of
smaller coil =
emf induced in the smaller
coil,
As
current varies as a function of , therefore,
?....(i)
Negative
sign indicates that emf induced opposes the main current in the long solenoid.
From
(i), we find that
Hence,
the variation of induced emf with
time t is represented by a straight line graph as shown in Fig. 4(EP).22.
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