Physics
Grade-9
Easy
Question
If the length and area of cross-section remain the same and resistivity increases. What will be the effect on the resistance?
- Increases
- Decreases
- Incomplete information
- Cannot say
Hint:
Resistance is directly proportional to the resistivity of the material.
The correct answer is: Increases
Let us consider,
Resistance = R
Resistivity = ρ
length of the wire = l
Area of the cross-sectional = A
We know that,
l and A are given constant
Thus,
R 
Hence, when the resistivity increases, resistance also increases
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