Two identical wires having different resistivity in ratio 1:3 the resistance of first wire is 20 ohm find the resistance of second resistance

Two identical wires having different resistivity in ratio 1:3 the resi

1.	Two identical wires having different resistivity in ratio 1:3 the resistance of first wire is 20 ohm find the resistance of second resistance
Answer» he two wires are identical they will have same area and cross- sectional area. The ratio of resistivity is 1: 3. By formula we know that resistance is where is the resistivity of the wire , l is the length of the wire & a is the cross-sectional area. When the LENGHTH of the conductor is VARIED , then its area also changes , e.g. When we stretch a wire , it becomes THIN , its lenght increases but its cross - sectional area decreases. During this TRANSFORMATION the Volume remains constant . ➳ When we INCREASE lenghth to then its resistance becomes :- ➳ When we increase area to then its resistance becomes :- ➳ When we increase radius to then its resistance becomes :-

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Two identical wires having different resistivity in ratio 1:3 the resistance of first wire is 20 ohm find the resistance of second resistance ​

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Two identical wires having different resistivity in ratio 1:3 the resistance of first wire is 20 ohm find the resistance of second resistance