| ⇦ | 
| ⇨ |
A wire of resistance 4 ohm is stretched to twice its original length. The resistance of stretched wire would be
Options
(a) 4Ω
(b) 8Ω
(c) 16Ω
(d) 2Ω
Correct Answer:
16Ω
Explanation:
Resistance R = ρℓ / A
ℓ’ = 2 ℓ ⇒ A’ = A / 2
R’ = ρ [2 ℓ / (A / 2)] = 4R = 4 × 4Ω = 16Ω
Related Questions: - The power factor of an AC circuit having resistance R and inductance L connected
- A body revolved around the sun 27 times faster than the earth. What is the ratio
- If a mass of 20g having charge 3.0 mC moving with velocity 20ms⁻¹ enters a region
- An aeroplane flies 400m due to North and then 300m due to south and then flies
- Under the action of a force F=cx, the position of a body changes from 0 to x.The work done
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The power factor of an AC circuit having resistance R and inductance L connected
- A body revolved around the sun 27 times faster than the earth. What is the ratio
- If a mass of 20g having charge 3.0 mC moving with velocity 20ms⁻¹ enters a region
- An aeroplane flies 400m due to North and then 300m due to south and then flies
- Under the action of a force F=cx, the position of a body changes from 0 to x.The work done
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