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OfflinePosted on : 09:49:56 AM on April 19, 2011
I have a question from electromagnetic induction i.e; why does a magnet lifts car or anything else or how a magnetic lift works as we know that magnet does no work.Then who is doing work.
(Originally referred to: AISHWARYA karnataki)
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Answers :
  spandan kundu | Posted on : 12:32:44 PM on April 20, 2011 Well,while lifting a car......gravity exerts a downward force
on the car,but it is taken up by the magnet.so by the
equation,W=F.s,gravity does negative work......since the body is
displaced in the direction just opposite to the direction in which
gravity exerts the force.this negative work is converted to potential
energy of the car and the magnet does work in lifting the magnet
against the downward force exerted by gravity. Moreover,this is a
doubt from work,energy power chapter not EMI... |
 Comment ! | |
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