Please solve thus question by step by step explanation... If its helpful then I mark that as brainlist....
Answers
Explanation:
(a)
R = ρ L/A
ρ = 1.7×10^-8 Ωm
L = ?
Diameter = 0.1 mm
Radius = Diameter /2 = 0.05 mm
A = π (0.05/1000)² ( 1mm = 1/1000 m)
π = 3.14
A = 3.14 × 25 * 10⁻¹⁰
R = 34 Ω
34 = 1.7×10^-8 * L / (25 × 3.14 × 10⁻¹⁰)
=> L = 5 * 3.14
=> L = 15.7 m
(b)
New Diameter = half
A ∝ Radius² or Diameter²
So new Area will be 1/4 of older area
R ∝ 1/A
so Resistance of new wire will be 4 times
R = 4 * 15.7
R = 62.8 Ω
New R : old R :: 4:1
Hope it helps!
Answer:
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Explanation:
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