Question

Pls answer the question

Answer 1

Answer:

resistivity=1.6*10⁻⁸m

resistance=10 ohm(R₁)

diameter=0.5 mm

radius=0.25mm=0.00025m=0.25*10⁻³m

area= πr²=3.14 × (0.0025)²=0.000000019625m²=0.19625*10⁻⁷m²

NOW,

10=1.6*10⁻⁸ * l/0.196*10⁻⁷

10* 0.196*10⁻⁷/1.6*10⁻⁸ =l

122.72m= l

IF DIAMETER IS DOUBLED,NEW RADIUS=0.5mm=0.5*10⁻³m

area=0.785*10⁻⁶m²

R₂= 1.6*10⁻⁸*122.72/0.785*10⁻⁶

R₂=2.5 ohm

R₂/R₁=2.5/10

R₂/R₁=1/4

R₂=1/4 R₁

Explanation: