An average induced e.m.f. of 1V appears ...

An average induced e.m.f. of `1V` appears in a coil when the current in it is changed from `10` `A` in one direction to `10A` in opposite direction in `0.5` sec. self-inductance of the coil is

`25 mH`

`50 mH`

`75 mH`

`100 mH`

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