Two long straight wires are arranged parallel to each other and are kept $20$ cm apart in vacuum. They carry currents of $2$ $A$ and $4$ $A$ respectively in the same direction. What will be the magnetic force on a length of $10$ cm of either wire? $(\mu_0 = 4\pi \times 10^{-7} \text{ SI units})$
- A$10^{-7} \text{ N}$
- B$2 \times 10^{-7} \text{ N}$
- C$4 \times 10^{-7} \text{ N}$
- D$8 \times 10^{-7} \text{ N}$
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