Question

1. The magnetic field B of a long current carrying wire at a point is obtained using the following formula:
           B=μ0 I /(2π r),        
where I is the current going through the wire and r is the distance of the point from the wire in cm. (a) Given the data in the table below, plot B versus 1/r and a best fitted line through them on the grid provided below. (b) Calculate the slope of the line. (c) Using the slope in part (b) and the fact that B is linearly proportional to 1/r calculate μ0. For part (c) I=5A.

B(mT)   .100   0.050   0.025   0.017   0.013   0.010
r(cm)   1   2   4   6   8   10
1/r(cm)   1   0.5   0.25   0.16   0.125   0.1

Answer 1