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Two wires A and B are made up of the same material and have the same mass. Wire A has radius of 2.0 mm and wire B has radius of 4.0 mm. The resistance of wire B is 2 . The resistance of wire A is .
32
R = lA = VA2 ( l = VA)
same mass and material same volume V R 1A2 1r4
RARB = ( rBrA )4 = ( 42 )4 = 16
RA = 16 2 = 32
Answer: 32
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