Two equal metal round plates are placed on small distance \( d\) in a magnetic field of induction \(B\) whose field lines are parallel with disc's axis . They are rotateing with same angular veocity \( \omega\) but in the oposite direction. If the centers of plates are connected with a thin conductive thread and charge density of plate's is \(\sigma(r)\) where \(r\) is distance from plates axis find \(\sigma(1 m)\).

\(B=0.1T\)

\(\omega=1 \frac{rad}{s}\)

\( d=10^{-12}m\)

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