The magnetic field at the origin due to the current flowing in the wire is -
The magnetic field at the origin due to the current flowing in the wire is -
- A
$-\frac{\mu_0 I}{8 \pi a }(\hat{ i }+\hat{ k })$
- B
$\frac{\mu_0 I}{2 \pi a }(\hat{ i }+\hat{ k })$
- C
$\frac{\mu_0 I }{8 \pi a }(-\hat{ i }+\hat{ k })$
- D
$\frac{\mu_0 I }{4 \pi a \sqrt{2}}(\hat{ i }-\hat{ k })$
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