I had this question given to me for homework and I didn\'t receive full credit.

Question

I had this question given to me for homework and I didn't receive full credit. My prof circled the + sign for Ba and the second radius for Ba. He also circled the - sign for Bb. However, I don't understand how to fix these to receive full credit. Please help.

This is what I had as a solution:

Ba= (uo * I) / (2pi * r) + (uo * I) / (2pi * r)

Ba= (uo * 3A) / (2pi * .1m) + (uo *3A) / (2pi * .25 m)

Ba = 8.4 x 10^-10 T

Bb= (uo * I) / (2pi * r) - (uo * I) / (2pi * r)

Bb= (uo * 3A) / (2pi * .05) - (uo * 3A) / (2pi * .25m + .05 m)

Bb= 9 x 10^ -6 T

Explanation / Answer

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