Physics · JEE | Moving Charges and Magnetism

A straight wire carrying a current of \( 10\text{ A} \) is placed in a horizontal table where the horizontal component of the earth's magnetic field is \( 3.0 \times 10^{-5}\text{ T} \) directed from south to north. If the current flows from east to west, the magnetic force per unit length on the wire is:

1. A
   \( 1.0 \times 10^{-4}\text{ N/m} \)
2. B
   \( 1.5 \times 10^{-4}\text{ N/m} \)
3. C
   \( 3.0 \times 10^{-4}\text{ N/m} \)
4. D
   \( 3.0 \times 10^{-5}\text{ N/m} \)