| ⇦ | 
| ⇨ |
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: - The earth radiates in the infrared region of the spectrum. The spectrum is correctly
- A block is moving up an inclined plane of inclination 60° with velocity of 20 ms⁻¹
- A body revolved around the sun 27 times faster than the earth. What is the ratio
- Three capacitors each of capacitance C and of breakdown voltage V are joined in series
- When we hear a sound, we can identify its source from
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The earth radiates in the infrared region of the spectrum. The spectrum is correctly
- A block is moving up an inclined plane of inclination 60° with velocity of 20 ms⁻¹
- A body revolved around the sun 27 times faster than the earth. What is the ratio
- Three capacitors each of capacitance C and of breakdown voltage V are joined in series
- When we hear a sound, we can identify its source from
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