A level Physics Magnetic Fields

For 13 it would be -322g, as current is reversed and doubles mean it experiences double the force but it will act upwards, therefore giving -322g. For 14, the one with the highest area will give the highest magnetic flux passing through between the loop, giving the highest force (well at least i think. The only topic in not very good at is magnetism, its pretty confusin sometimes lol).

Okay cheers, I get 14, the magnetic flux is proportional to area. But with 13, I know the force on the wire is doubled and in the opposite direction, but how do you get a negative reading on the mass scale that's what's confusing me. I feel like I'm missing something here..

Ok so ill try and explain. Imagine a hypothetical scenario (or you can actually do it yourself if you have a balance) where you put force down on a balance, and then zero it. The reading will be 0g. Now apply a little bit less force down in the balance, it will now give you a negative reading. It doesnt mean theres negative mass, is just means that relative to the zeroed reading, there is a negative value.

After re-reading the question like 50 times it finally made sense... I understood your example perfectly, but this question and its wording were just confusing for me. Thanks for your help mate!