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Conventional current and charge flow

Question:

Which one of the following situations results in a conventional electric current that flows westward?




a beam of protons moves eastward
a electric dipole moves westward
a beam of electrons moves westward
a beam of electrons moves eastward
a beam of neutral atoms moves westward


Answer

As I am sure you know the conventional the direction of an electric current is the movement of charges from positive to negative in other words a flow of positive charges.

We need to look at the options and see if we can find positive charges moving to the west or of course negative charges moving to the east.

In your options the only possibility is: a beam of electrons moves eastward


The others are no good because:
a beam of protons moves eastward - positive charges moving east
a electric dipole moves westward - a dipole has no net charge
a beam of electrons moves westward - negative charges moving west
a beam of neutral atoms moves westward - neutral atoms have no net charge
 

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© Keith Gibbs 2020