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The graph showing the variation of the magnetic field strength $B$ with distance $r$ from a long current carrying conductor is
Options:
- A
- B
- C
- D
Solution:
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Verified Answer
The correct answer is:
Magnetic field strength $B$ due to long straight current carrying conductor at a distance $r$ is given as
$$
\begin{aligned}
B &=\frac{\mu_{0}}{2 \pi} \cdot \frac{I}{r} \\
\Rightarrow \quad & B \propto \frac{1}{r}
\end{aligned}
$$
Hence, correct variation of $B$ with $r$ is shown in the graph given in option (c).
$$
\begin{aligned}
B &=\frac{\mu_{0}}{2 \pi} \cdot \frac{I}{r} \\
\Rightarrow \quad & B \propto \frac{1}{r}
\end{aligned}
$$
Hence, correct variation of $B$ with $r$ is shown in the graph given in option (c).
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