Created by StemPy LabTwo small beads are threaded on a smooth, straight, horizontal insulating wire, apart, as in the figure. Bead carries and bead carries , and both are free to slide. A third charged bead is threaded on the same wire and placed so that none of the three beads moves. Treat the beads as point charges, and ignore everything except the forces between them. What is the charge on , with its sign? Give the answer in .
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← A very long, thin straight wire carries a uniform positive charge per unit length λ. An electron moves round the wire in a circle of radius 2.0 cm, in a plane at right angles to the wire, with a steady speed of 4.0 × 10⁶ m/s. The wire is far from all other charges. The electron is held in its orbit by the electric force alone; neglect gravity and any magnetic effects. Take 1/4πε₀ = 9.0 × 10⁹ N m² C⁻², e = 1.60 × 10⁻¹⁹ C and me = 9.11 × 10⁻³¹ kg. What is λ? Give the answer in nC/m, to two decimal places.A thin flat washer has a round hole in its middle. Its inner radius is 12 cm and its outer radius is 40 cm. A point charge of +12 nC is held on the axis of the washer, 9.0 cm from its centre, as in the figure. The washer is uncharged and does not change the field. Take ε₀ = 8.85 × 10⁻¹² C² N⁻¹ m⁻². What is the electric flux through the washer, not counting the hole, taken in the direction away from the charge? Give the answer in N m²/C, to the nearest whole number. →
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