Physics magnetic flux density problem?

Hello, I'm writing a physics paper tomorrow and have a question about this problem on magnetic flux density. This should be calculated in the problem. However, I'm stuck because of the length. It only says "for a 5mm longer piece of conductor" and not how long it was before? And I can't calculate the value without having given B, can I? The picture is about problem B10.

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isohypse
1 year ago

One has a certain force per length.

(if I and B remain the same)

Here the length increases by 5mm, the force around 0.6mN, therefore the field