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NCERT Class XII Chapter
Moving Charges and Magnetism
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Question : 2 of 28
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A long straight wire carries a current of 35 A. What is the magnitude of the field B at a point 20 cm from the wire?
Solution:  
Magnetic field due to a long straight wire
B = μ04π2Ir\frac{\mu_0}{4\pi} \frac{2I}{r} or B = 10−7×2×3520×10−210^{-7} \times \frac{2 \times 35}{20 \times 10^{-2}} = 3.5 × 10−510^{-5} T
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