Questions
Dimensions of a block are 1 cm x 1 cm x 100 cm. If specific resistance of its material is ohm-m, then the resistance between the opposite rectangular faces is
detailed solution
Correct option is B
Length l=1 cm=10−2mArea of cross-section A = 1 cm x 100 cm=100 cm2=10−2m2Resistance R=3 × 10−7 × 10−210−2 = 3 × 10−7 ΩTalk to our academic expert!
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In an electrical cable there is a single wire of radius 9 mm of copper. Its resistance is 5Ω . The cable is replaced by 6 different insulated copper wires, the radius of each wire is 3 mm . Now the total resistance of the cable will be
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