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
Answer:A
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