| ⇦ | 
| ⇨ |
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 battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
- When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles
- Hard X-rays for the study of fractures in bones should have a minimum wavelength
- Two coherent sources of different intensities send waves which interfere.
- The electric vector vibration of an electromagnetic wave is given by
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
- When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles
- Hard X-rays for the study of fractures in bones should have a minimum wavelength
- Two coherent sources of different intensities send waves which interfere.
- The electric vector vibration of an electromagnetic wave is given by
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