A U-tube is open on both ends and partially filled with water. Benzene (does not mix with water, density = 897 kg/m3) is poured
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The current intensity is defined as the amount of charge Q that passes through a certain point of an electrical wire in a time interval of 
:
In our problem, the current intensity is
while the amount of charge that passes a certain point of the wire is
If we re-arrange the previous equation:
we can find the time needed for this amount of charge to pass through a point of the wire:
In our problem, the current intensity is
while the amount of charge that passes a certain point of the wire is
If we re-arrange the previous equation:
we can find the time needed for this amount of charge to pass through a point of the wire: