KCET · Physics · Magnetic Effects of Current
Magnetic field at a distance \(r\) from an infinitely long straight conductor carrying a steady current varies as
- A \(\frac{1}{\sqrt{r}}\)
- B \(\frac{1}{r^{2}}\)
- C \(\frac{1}{r}\)
- D \(\frac{1}{r^{3}}\)
Answer & Solution
Correct Answer
(C) \(\frac{1}{r}\)
Step-by-step Solution
Detailed explanation
We have \(B=\frac{\mu_{0}}{4 \pi} \cdot \frac{2 l}{r}\)
\(\therefore \mathrm{B} \propto \frac{1}{\mathrm{r}}\)
\(\therefore \mathrm{B} \propto \frac{1}{\mathrm{r}}\)
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