Two metallic wires made from copper have same length but the radius of wire 1 is

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

Options:

A . 2R

B . R/2

C . 5R/4

D . 3R/4

Answer: Option C

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