Question

QUESTION 7

1. Electrostatic precipitators use electric forces to remove pollutant particles from smoke, in particular in the smokestacks of coal-burning power plants. One form of precipitator consists of a vertical, hollow, metal cylinder with a thin wire, insulated from the cylinder, running along its axis (See figure). A large potential difference is established between the wire and the outer cylinder, with the wire at lower potential. This sets up a strong radial electric field directed inward. The field produces a region of ionized air near the wire. Smoke enters the precipitator at the bottom, ash and dust in it pick up electrons, and the charged pollutants are accelerated toward the outer cylinder wall by the electric field. Suppose the radius of the central wire is r = 92 μm, the radius of the cylinder is R = 14.3 cm, and a potential difference of ΔV = 49.8 kV is established between the wire and the cylinder. Also assume that the wire and cylinder are both very long in comparison to the cylinder radius, so they are considered as infinite. What is the magnitude of the electric field midway between the wire and the cylinder wall? (Give your answer in decimal using kV/m as unit)

Answer 1

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answered by: anonymous