| ⇦ | 
| ⇨ |
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: - A circular disc X of radius R is made from an iron plate of thickness t and another disc
- The time period of a thin bar magnet in Earth’s magnetic field is T
- Moment of inertia, along the diameter of a ring is
- In Young’s double slit experiment, the ratio of maximum and minimum intensities
- A particle covers half of its total distance with speed v1 and the rest half distance
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A circular disc X of radius R is made from an iron plate of thickness t and another disc
- The time period of a thin bar magnet in Earth’s magnetic field is T
- Moment of inertia, along the diameter of a ring is
- In Young’s double slit experiment, the ratio of maximum and minimum intensities
- A particle covers half of its total distance with speed v1 and the rest half distance
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