ElectroMagnetic InductionHard
Question
A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure, The time varition of the magnitude of emf generated across the coil during on cycle is
Options
A.
B.
C.
D.
Solution
We know that electromagnetic e.m.f. induced,
e = -
Intially, dφ will be positive (during first
time period)then it becomes negative during the period from to 
During the period to 
it is again
positive and in the last
time it is negative.
Accordingly sign of emf produced will be cahnged. Figure(a) fits exactly in this change pattern So this figure resents the answer.
e = -
Intially, dφ will be positive (during first
time period)then it becomes negative during the period from to During the period
to it is againpositive and in the last
time it is negative.Accordingly sign of emf produced will be cahnged. Figure(a) fits exactly in this change pattern So this figure resents the answer.
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