| ⇦ | 
| ⇨ |
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 nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
- If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
- A body of weight W newton is at the surface of the earth.
- In a transistor the collector current is always less than the emitter current
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A nucleus ᵐₙ X emits one α- particle and two β- particles. The resulting nucleus is
- If the wavelength of light in vacuum be, the wavelength in a medium of refractive index
- A body of weight W newton is at the surface of the earth.
- In a transistor the collector current is always less than the emitter current
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
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