A long straight wire carries a current of 18 A . The magnitude of the magnetic field at a point 12 cm from it is
- A$1.5 \times 10^{-5} \mathrm{~T}$
- B$2 \times 10^{-5} \mathrm{~T}$
- C$3 \times 10^{-5} \mathrm{~T}$
- D$1.8 \times 10^{-5} \mathrm{~T}$
✓ Correct answer: C
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