In a closed circuit, the current / (in a...

In a closed circuit, the current / (in ampere) at an instant of time t (in second) is given by l = `4-0.08t`. The number of electrons flowing in 50 s through the cross-section of the conductor is

`1.25xx10^(19)`

`6.25xx10^(20)`

`5.25xx10^(19)`

`2.25xx10^(20)`

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