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.
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
I've always been counting a force before. Thank you.