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A Geiger counter detects
Figure P23.62
to an audible “click” Suppose the radius of the central wire is 1.45 μm and the radius of the hollow cylinder is 1.80 cm. What potential difference between the wire and the cylinder produces an electric field of 2.00 × 104 V/m at a distance of 1.20 cm from the axis of the wire? (The wire and cylinder are both very long in comparison to their radii, so the results of Problem 23.61 apply.)
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