COMEDK · Physics · 21. Magnetic Effects of Current
A horizontal overhead power line carries a current of \(90 \mathrm{~A}\) in East to West direction. What is the magnitude and direction of the magnetic field due to the current, \(1.5 \mathrm{~m}\) below the line?
- A \(1.2 \times 10^{-5} \mathrm{~T}\), towards South
- B \(1.2 \times 10^{-5} \mathrm{~T}\), towards North
- C \(1.2 \times 10^{-5} \mathrm{~T}\), towards East
- D \(1.2 \times 10^{-5} \mathrm{~T}\), towards West
Answer & Solution
Correct Answer
(A) \(1.2 \times 10^{-5} \mathrm{~T}\), towards South
Step-by-step Solution
Detailed explanation
The given situation is shuwn below Magnetic fiekl at point \(P_{\text {, }}\) \[ \begin{aligned} B &=\frac{\mu_{0}}{9 x}, \frac{l}{r} \\ &=2 \times 10^{-7} \times \frac{90}{1.5} \\ &=1.2 \times 10^{-6} \mathrm{~T}(\text { Sonth }) \end{aligned} \]
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