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For a circular current loop magnitude of magnetic field on axis of loop at a point distant \( x \) from centre of loop \( (x \gg \) and magnetic dipole moment of loop is \( \mathbf{m}=I \mathbf{A}) \) is
(a) \( \mathbf{B}=\frac{\mu_{0} \mathbf{m}}{x^{3}} \)
(b) \( \mathbf{B}=\frac{\mu_{0}}{4 \pi} \frac{\mathbf{m}}{x^{3}} \)
(c) \( \mathbf{B}=\frac{\mu_{0}}{4 \pi} \frac{2 \mathbf{m}}{x^{3}} \)
(d) \( \mathbf{B}=\frac{\mu_{0} \mathbf{m} \cdot R}{2 \pi x^{3}} \)
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