- #1
hiigaranace
- 10
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Homework Statement
"A closed circuit consists of two semicircles of radii 40cm and 20cm that are connected by straight segments. A current of 3.0 A exists in this circuit and has a clockwise direction. Find the magnetic field at point P (center of the figures).
Homework Equations
B = (mu * I)/(2piR)
The Attempt at a Solution
I had thought adapting the above equation would be the way to go, just using two different radii. I ended up with:
[tex]\frac{1}{2}[/tex][tex]\mu[/tex][tex]\frac{I}{2\pi}[/tex] * [tex]\left(\frac{1}{20} - \frac{1}{40}\right)[/tex]
LaTeX didn't like the above, so in plaintext:
(1/2)(mu0 * I)/(2pi) * (1/20-1/40)
This didn't work, though, and I'm not entirely sure why.