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Two metal wires have the resistivity 1.62 × 10-8 ohm meter and 4.68 × 10-8 ohm meter .Comapre the resistance if A is twice long as B and half of its diameter |
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Answer» vity of WIRE A , = 1.62 × 10^-8 OHM. m resistivity of wire B , = 4.68 × 10^-8 ohm . m Let length of wire B is lthen, length of wire A will be 2lsimilarly , Let's assume that DIAMETER of wire A is d then, diameter of wire B will be 2d.we know, where R is resistance, is resistivity, l is the length of the wire and a is CROSS sectional area. so, resistance of wire A , and resistance of wire B, |
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