Created by StemPy LabA thin ring of radius carries a positive charge spread uniformly round it. A small particle of mass and charge is placed on the axis of the ring, very close to its centre, and released. Gravity can be ignored. The particle oscillates along the axis. The period of these small oscillations is
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← A uniform rope 2.5 m long hangs freely from a hook in the ceiling, as shown in the figure. A small sideways pulse is made at its bottom end and travels up to the hook. Taking g = 10 m/s², the time the pulse takes to reach the top isAn isolated parallel-plate capacitor in air has plates of area 0.02 m², and carries charges of +2 µC and -2 µC on its plates. Take ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻². The force with which the plates attract each other is closest to →
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