The force acting per unit length on a very long straight conductor carrying a steady current of $1 \,A$ flowing from south to north is: (The horizontal component of the earth's magnetic field at the place is $3 \times 10^{-5} \,T$ and its direction is from geographical south to geographical north.)
- A$3 \times 10^{-5} \,N/m$
- B$1 \times 10^{-5} \,N/m$
- C$0$
- D$1.5 \times 10^{-5} \,N/m$
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