Question

Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is r. If both the wires are joined together in series, the total resistance becomes

Answer 1

Since the resistance of wire A is half that of the wire B.....the resistance in the wire A becomes 4 times that of wire B

therfore,

A= 4r B=r

When both the wires are joined in series ;

refer to the above attachment

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