PhysicsBowl 2018 Q25

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25) This question asks us to find the total number of electrons that pass through a horizontal wire with the given conditions. We know the current and the time interval during which the constant current is passing through the wire.

We want to find the number of electrons that pass through the wire. To do so, we can find the total charge divided by the charge in one electron.

Where I is current, Q is the total charge, t is the total time, and e is the charge of an electron

We are given I(current) and t(time), and e(charge of an electron) is a known constant. Remember though, that we need to convert time from hours to seconds.

Where I is current, Q is the total charge, t is the total time, and e is the charge of an electron

Answer: D