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An electron moving with velocity \( v \) along the \( x \) axis approaches a circular current carrying loop as shown in the figure. The magnitude of magnetic force on electron at this instant is
(A) \( \frac{\mu_{0}}{2} \frac{e v i R^{2} x}{\left(x^{2}+R^{2}\right)^{3 / 2}} \)
(B) \( \mu_{0} \frac{e v i R^{2} x}{\left(x^{2}+R^{2}\right)^{3 / 2}} \)
(C) \( \frac{\mu_{0}}{4 \pi} \frac{e v i R^{2} x}{\left(x^{2}+R^{2}\right)^{3 / 2}} \)
(D) 0
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