A small piece of metal wire is dragged across the gap between the pole pieces of a magnet in 10 s. The magnetic flux between the pole pieces is `8 xx 10^(-4)` Wb. Find the magnitude of induced e.m.f.

Explanation

`dt = 10 s, phi_(1) = 8 xx 10^(-4) Wb, e = ?, phi_(2) = 0`
`e = (- d phi)/(dt) = (-(phi_(2) - phi_(1)))/(dt) = (-(0 - 8 xx 10^(-4)))/(10)`
`= 8 xx 10^(-5) V`