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 of their respective lengths must be
As we learnt in
- wherein
resistivity / specific resistance
Resistance of a wire
Option 1)
This option is correct.
Option 2)
This option is incorrect.
Option 3)
This option is incorrect.
Option 4)
This option is incorrect.
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