- #1
Jimbob999
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Homework Statement
A 45-m long wire is coiled so that it makes a coil containing 100 circular loops, one on top of the other. If the wire carries a current of 13 A, what is the magnetic dipole moment of the coil?
21 A·m2
6.7 A·m2
3.3 A·m2
2.6 A·m2
1.2 A·m2
Homework Equations
B(z) = u0/2pi x u/z^3
Where u0 is the permeability constant and u is the magnetic dipole moment
The Attempt at a Solution
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I can get as far as B(z) = (2 x 10^7 u)/z^3
I know I need to find u.
It doesn't seem to mention where exactly z is, thus can't work out magnetic field. Do you think there is enough information provided in this question to solve it?
Thanks.