Current Electricity and Electrical InstrumentHard
Question
A material ′B′ has twice the specific resistance of ′A′. A circular wire made of ′B′ has twice the diameter of a wire made of ′A′. Then for the two wires to have the same resistance, the ratio lA /lB of their respective lengths must be
Options
A.2
B.1
C.
D.
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