Physics Help Forum Motional EMF related question
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 Mar 6th 2013, 07:52 AM #1 Junior Member   Join Date: Mar 2013 Posts: 1 Motional EMF related question A metallic rod is held horizontally along east-west direction, is allowed to fall under gravity. Will there be an EMF induced at its ends? Justify your answer. My answer - The magnetic field of Earth is constant and hence there is no magnetic flux change and hence no EMF. Friend's answer - The free electrons on the rod experience a force due to magn. field given by F=qvXB Hence electrons move to one side and EMF is induced. Please tell me which answer is correct.
Mar 6th 2013, 03:20 PM   #2
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 Originally Posted by skatetony A metallic rod is held horizontally along east-west direction, is allowed to fall under gravity. Will there be an EMF induced at its ends? Justify your answer. My answer - The magnetic field of Earth is constant and hence there is no magnetic flux change and hence no EMF. Friend's answer - The free electrons on the rod experience a force due to magn. field given by F=qvXB Hence electrons move to one side and EMF is induced. Please tell me which answer is correct.
Your friend. Moving a conductor perpendicular to a field is equivalent to moving a field with respect to a conductor.
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# if we fall a metalic rod under gravity what will be the emf

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