18. The drawing shows two perpendicular, long, straight wires, both of which lie in the plane of the paper. The current in each of the wires is \( \mathrm{I}=5.6 \mathrm{~A} \). Find the magnitudes of the net magnetic fields at points A and B .
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The magnetic field \( B \) at a distance \( r \) from a wire carrying current \( I \) is given by: \[ B = \frac{\mu_0 I}{2\pi r} \] where \( \mu_0 = 4\pi \times 10^{-7} \, \text{T}\cdot\text{m/A} \). Show more…
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