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What is the ratio of their cross-sectional areas

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(i) An air-filled capacitor is charged, then disconnected from the power supply, and finally connected to a voltmeter. Explain how and why the voltage reading changes when a dielectric is inserted between the plates of the capacitor.

(ii) Two wires, A and B, of circular cross-section are made of the same metal and have equal lengths, but the reistance of wire A is three times greater that that of wire B. What is the ratio of their cross-sectional areas? How do their radii compair?

Reference no: EM132536703

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