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Question
A conducting rod held horizontally along East- West direction is dropped from rest from a certain height near the Earth’s surface. Why should there be an induced emf across the end of the rod? Draw a plot showing the instantaneous variation of emf as a function of time from the instant it begins to fall.
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Solution
Emf induced due to change of magnetic flux across rod due to the presence of Earth’s magnetic field.
We know,
`E =(dphi_B)/(dt)`
As the Earth’s magnetic field is uniform,
`E =-Blv = -Bl (dx)/(dt)`
Hence,
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