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An infinitely long straight conductor carries a current of 150 A. At what distance from the conductor is the magnetic field caused by the current equal to 10-4 T ? |
1.5 m 0.3 m 3.0 m 0.15 m |
0.3 m |
$ B = \frac{\mu_0 I}{2\pi r} = 2\times 10^{-7} \frac{150}{r} = 10^{-4}$ $\Rightarrow r = 0.3 m$ |
