An electrical cable of copper has just one wire of radius 9
mm. Its resistance is 5 ohm. This single copper wire of the
cable is replaced by 6 different well insulated copper wires
each of radius 3 mm. The total resistance of the cable will
now be equal to
(a) 7.5 ohm (b) 45 ohm
(c) 90 ohm (d) 270 ohm
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