Current in a 10 milli henry coil increases uniformly form zero to one to one ampere in 0.01 second, then the value of induced e.m.f. is

1V  2V -2V -1V

-1V

Induced Emf $\xi = -L\frac{di}{dt} = -10\times10^{-3}\times \frac{1-0}{0.01} = -1V$