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An element \( \Delta I=\Delta x \hat{\mathbf{i}} \) is placed at the origin and carries a current \( I=10 \mathrm{~A} \).
If \( \Delta x=1 \mathrm{~cm} \), magnetic field at point \( P \) is
- (a) \( 4 \times 10^{-8} \hat{\mathbf{k}} \mathrm{T} \)
- (b) \( 4 \times 10^{-8} \hat{\mathbf{i} ~ T} \)
- (c) \( 4 \times 10^{-8} \hat{\mathbf{j} ~ T} \)
- (d) \( -4 \times 10^{-8} \hat{\mathbf{j}} \mathrm{T} \)
\( \mathrm{P} \)
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