What would you use to measure how much milk is in a jug?

Millilitres

Explanation:

Most likely, in order to measure how much milk there is in a jug, you would use millilitres. This is one of the most common units to measure volume. Depending on how large the jug is, you could also use litres. 1000 millilitres is equivalent to 1 litre, which would help you make conversions.

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).