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If a current loop of radius \( R \) carrying a anti-clockwise current \( I \) is placed in a plane parallel to \( Y Z \)-plane, then magnetic field at a point on the axis of the loop is given by
(a) \( \mathbf{B}=\frac{\mu_{0} I R^{2}}{2\left(x^{2}+R^{2}\right)^{3 / 2}} \hat{\mathbf{j}} \)
(b) \( \mathbf{B}=\frac{\mu_{0} I R^{2}}{2\left(x^{2}+R^{2}\right)^{3 / 2}} \hat{\mathbf{k}} \)
(c) \( \mathbf{B}=\frac{\mu_{0} I R^{2}}{2\left(x^{2}+R^{2}\right)^{3 / 2}} \hat{\mathbf{i}} \)
(d) \( \mathbf{B}=\frac{\mu_{0} I R^{2}}{2\left(x^{2}+R^{2}\right)^{3 / 2}}(\hat{\mathbf{i}} \times \hat{\mathbf{k}}) \)
W)
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