$AB$ and $CD$ are long straight conductor, distance $d$ apart, carrying a current $I$. The magnetic field at the midpoint of $BC$ is
$AB$ and $CD$ are long straight conductor, distance $d$ apart, carrying a current $I$. The magnetic field at the midpoint of $BC$ is
- A
$\frac{{ - {\mu _0}I}}{{2\pi d}}\hat k$
- B
$\frac{{ - {\mu _0}I}}{{\pi d}}\hat k$
- C
$\frac{{ - {\mu _0}I}}{{4\pi d}}\hat k$
- D
$\frac{{ - {\mu _0}I}}{{8\pi d}}\hat k$
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- [JEE MAIN 2020]
A current of $i$ ampere is flowing through each of the bent wires as shown the magnitude and direction of magnetic field at $O$ is
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- [AIIMS 2008]
Define law for finding the direction of a magnetic field due to a circular current loop.
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