| ⇦ | 
| ⇨ |
Two wires of equal length and equal diameter and having resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination is
Options
(a) ρ₁+ρ₂/2
(b) ρ₁+ρ₂
(c) ρ₁ρ₂/ρ₁+ρ₂
(d) √ρ₁ρ₂
Correct Answer:
ρ₁+ρ₂/2
Explanation:
The resistance of two wires are
R₁ = ρ₁ (l / A) and R₂ = ρ₂ (l / A)
Now, equivalent resistance of series connection of wire
Req = R₁ + R₂ = ρ₁ (l / A) + ρ₂ (l / A) = (l / A) (ρ₁ + ρ₂)
The equivalent resistance Req can be given by Req = ρ(eq) (l / A)
⇒ ρ(eq) (l / A) = (l / A) (ρ₁ + ρ₂)
Hence, ρ(eq) = (ρ₁ + ρ₂) / 2
Related Questions: - Two discs of same material and thickness have radii 0.2 m and 0.6 m.
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- A thin circular ring of mass M and radius R is rotating in a horizontal plane about
- The sun light reaches us as white and not as its components because
- If the nucleus ²⁷₁₃Al has nuclear radius of about 3.6 fm
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two discs of same material and thickness have radii 0.2 m and 0.6 m.
- When an object is placed 40cm from a diverging lens, its virtual image is formed 20 cm
- A thin circular ring of mass M and radius R is rotating in a horizontal plane about
- The sun light reaches us as white and not as its components because
- If the nucleus ²⁷₁₃Al has nuclear radius of about 3.6 fm
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply