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A very long conductive rod (cylindrical in shape) is held in the water. The shank radius is 20 mm . An external electrostatic field exists

A very long conductive rod (cylindrical in shape) is held in the water. The shank radius is 20 mm. An external electrostatic field exists in water and is = + (volts/meter). If the stem is aligned with the z axis, find an expression for the surface charge density at the surface of the rod. [ = and = ]

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