- #1
dmsgo89
- 10
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Homework Statement
A long, straight wire with linear mass density of 45g/m is suspended by threads, as shown in the figure . There is a uniform magnetic field pointing vertically downward. A 7.0A current in the wire experiences a horizontal magnetic force that deflects it to an equilibrium angle of 10 degree. What is the strength of the magnetic field B?
Homework Equations
B=(U_o I) / (2 *3.14 * r)
The Attempt at a Solution
I have U_0 given, I given. but can't find r.
How can find r to get B?