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The horizontal component of the earth's magnetic field at a certain place is \( 3.0 \times 10^{-5} \mathrm{~T} \) and the direction of the field is from the geographic south to the north pole. A very long straight conductor is carrying a steady current of \( 1 \mathrm{~A} \).
What is the force per unit length when the direction of the current is south to north?
(a) \( 5 \times 10^{-4} \mathrm{Nm}^{-1} \)
(b) Zero
(c) \( 6 \times 10^{-2} \mathrm{Nm}^{-1} \)
(d) \( 8 \times 10^{-3} \mathrm{Nm}^{-1} \)
\( \mathrm{P} \)
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