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The magnetic field at a distance $r$ from a long wire carrying current i is $0.4$ tesla. The magnetic field at a distance $2 \mathrm{r}$ is
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The correct answer is:
$0.2$ tesla
Magnetic field due to long wire,
$$
B=\frac{\mu_{0} i}{2 \pi r} \text { or } B \propto \frac{1}{r}
$$
When $r$ is doubled, the magnetic field becomes half, i.e., now the magnetic field will be $0.2 \mathrm{~T}$.
$$
B=\frac{\mu_{0} i}{2 \pi r} \text { or } B \propto \frac{1}{r}
$$
When $r$ is doubled, the magnetic field becomes half, i.e., now the magnetic field will be $0.2 \mathrm{~T}$.
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