The magnetic field 0.02 m from a wire is 0.1 T. What is the magnitude of the magnetic field 0.01 m from the same wire?

Answer 1

B=k I/r

so if you reduce r by a factor of 1/10, B is now x10, or 1 Tesla

Answer 2

that's not one of the choices

Answer 3

Here are the choices:
0.01 T
0.05 T
0.1 T
0.2 T

Answer 4

oops, you should have caught my error. You reduced distance by 1/2, so B is twice or .2T

Answer 5

Its B Duhhhhh easy