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Homework Statement
A wire with radius R= .01 m carries a current with uniform density. At a distance r1 =1.25m from the wire, the magnetic field has a magnitude of 2.55 μT. Calculate the magnitude of the magnetic field r2=.0065m from the wire.
Homework Equations
B= (μ0I)/ 2πr
The Attempt at a Solution
So first I did:
B1=(μ0I)/( 2πr1)
Solving for I:
I = (B12πr1)/μ0
Plugging it into the B2 equation:
B2=(μ0B12πr1)/(2πr2μ0)
= (B1r1)/r2
=4.9 x 10^-4 T
I'm not sure if I did this right since other people in my class got something different. Can someone corroborate this? Thanks.