1.

A coil of 50 turns is pulled in 0.02 s fron between the poles of a magnet, where its are: includes magnetic flux of 31 xx 10^(-6) Wb to the place, where its area includes 1 xx 10^(-6) Wb. The average emf is ____

Answer»

`7.5xx10^(-2)`V
`7.5xx10^(-3)` V
0
`7.5xx10^(-4)` V

SOLUTION :`epsilon=-N(Deltaphi)/(Deltat)`
`=-N[(phi_2-phi_1)/(Deltat)]`
`=-50[(1xx10^(-6)-31xx10^(-6))/0.02]`
`=+(50xx30xx10^(-6))/(2xx10^(-2))`
`therefore epsilon=7.5xx10^(-2)` V


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