What is the wires linear charge density
A proton orbits a long charged wire, making 1.50 times 10^{6} revolutions per second. The radius of the orbit is 1.60 cm. What is the wire's linear charge density?
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The solid part of the disk has a uniform charge density, (sigma symbol), on its surface. Derive an expression for the total electric charge on the solid part of the disk.
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