A particle carrying a charge equal to 1000 times the charge on an electron, is rotating one rotation per second in a circular path of radius '$r$' m. If the magnetic field produced at the centre of the path is $x$ times the permeability of vacuum, the radius '$r$' in m is $[e = 1.6 \times 10^{-19} \text{C}] \quad [x = 2 \times 10^{-16}]$
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Current in a loop is charge times frequency of revolution ($I = q/T$).