two wires a and b are of equal length and have equal resistance . if the resistivity of A is more than that of B which wire is thicker and why
Answer with explanation
Answers
Radius of the roller (r) = 84/ 2 cm = 42 cm Length of the roller (h) = 120 cm Curved surface area of the roller = 2πrh = 2 × 22/ 7 × 42 × 120 cm2 = 44 × 720 cm2 = 31680 cm2 ∴ area covered by the roller in 1 revolution = 31680 cm2 ∴ area covered by the roller in 500 revolutions = 31680 × 500 cm2 = 15840000 cm Hence, area of the playground = 15840000/ 100× 100 m2 = 1584 m2
Explanation:
Suppose Resistance of A as Ra and resistance of B as Rb.
Ra=Rb
PaLa/Aa = PbLb/Ab
Pa= Rho for conductor a; Pb= Rho for Conductor B
Aa= Area of A; Ab= Area of B
La= Length of A; Lb= length of B.
Where length of both are same, La=Lb
Pa/Aa = Pb/Ab
or
Pa/Pb = Aa/Ab
Condition that Pa>Pb means Pa/Pb is greater than 1.
Pa/Pb=Aa/Ab >1
Aa/Ab >1
Or
Aa > Ab
The A conductor is thicker than B.
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