Q93 / 110 · VITEEE 2024 · Physics

Which of the following graph represents the variation of magnetic flux density $B$ with distance $r$ for a straight long wire carrying an electric current?

  • A
    Figure
  • B
    Figure
  • Correct answer
    C
    Figure
  • D
    Figure

Solution

Magnetic field density $B$ due to long straight current carrying conductor at a distance $r$ is given as $B=\frac{\mu_0}{2 \pi} \cdot \frac{i}{r}$ i.e. $B \propto \frac{1}{r}$ Hence, option (3) is correct.

Hence, the correct answer is option: 'C'.

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