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What is the momentum acquired by the electron in a wire of length `1` meter when a current of `1` ampere start floeing in wire ? The mass and charge of electron are `m` and arespectively |
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Answer» Let A be the area of the cross section of the wire Then volume of the wire `= AL` If `n` is the no density (i.e. no of electron per unit volume ) then number of electron in the wire is `N = A 1n` If `v_(d)` is the dreft velocity of electron in meter wire , then momentum acquired by the electron `= mv_(d) ` momentum acquired by wire = momentum acquiredd by all the electron `= (mv_(d) ) xx A //m` `= m xx((1)/(nAe)) xx Aln = (iml)/(e)` |
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