Question
Physics Question on Current electricity
The length of a metallic wire is increased by 20% and its area of cross section is reduced by 4%. The percentage change in resistance of the metallic wire is ______
Answer
š
= šš/š“
š
ā² = šĆ1.2š/0.96š“ = 10/8 Ć š
= 1.25 š
It means 25 % increase in Resistance.