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NCERT Class XII Chapter
Moving Charges and Magnetism
Questions With Solutions

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Question : 4 of 28
Marks: +1, -0
A horizontal overhead power line carries a current of 90 A in east to west direction. What is the magnitude and direction of the magnetic field due to the current 1.5 m below the line?
Solution:  
The standard directions on the plane of paper can be different according to requirements.
The magnitude of magnetic field,
B = μ04π2Ir\frac{\mu_0}{4\pi} \frac{2I}{r} = 10−7×2×901.510^{-7} \times \frac{2 \times 90}{1.5} = 120 × 10−710^{-7} T
Direction of magnetic field can be observed by right hand palm rule and it is southward.
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