when the diameter of a conductor is doubled then it's resistance decreases how many times?
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When the diameter of a conductor is doubled then its resistance decreases by 4 times.
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Resistance (R) is inversely proportional to Area(A). So if radius is doubled, new area= 4x Area of original wire. So the resistance becomes 1/4th of original value. ... As you can see in the picture if you increase the diameter of the wire then the resistance will decrease
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