1. Examine the graph for the run in which you use a triangle waveform to drive t
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Question
1. Examine the graph for the run in which you use a triangle waveform to drive the current in the primary solenoid. Describe the rate of change of the current in the primary solenoid at different points in a given cycle. What effect would this have had on the magnetic flux passing through the secondary solenoid?
2. From your understanding of Faraday’s law, sketch your prediction of the shape of the graph of induced emf vs. time. Your sketch should indicate how the induced emf responds to changes in the current.
Current (A) 0.5 t3 -0.5 0.05 0.1 0.15 0.2 Time (s)Explanation / Answer
for the givne triangular waveform
di/dt = k for t < 0.1 s , t > 0 s
di/dt = -k for 0.1 < t < 0.2
where k > 0
now, magnetic flux in the coil depends on currnent and its direction
hence the magnetic flux will linearly increase till t = 0.1s and then linearly decrease to the original value in the same time, inearly
2. now, induced emf is dependent on -di/dt
hence
induced emf V = -k for t < 0.1 s
V = k for t > 0.1 s
where k is some constant k > 0
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