| ⇦ | 
| ⇨ |
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: - In circular coil, when number of turns is doubled and resistance becomes 1/4th
- A current I ampere flows along the inner conductor of a co-axial cable and returns
- If the wavelength of incident light falling on a photosensitive material decreases,
- The voltage of clouds is 4×10⁶ volt with respect to ground. In a lightening
- The minimum velocity (in ms⁻¹) with which a car driver must traverse a flat curve
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In circular coil, when number of turns is doubled and resistance becomes 1/4th
- A current I ampere flows along the inner conductor of a co-axial cable and returns
- If the wavelength of incident light falling on a photosensitive material decreases,
- The voltage of clouds is 4×10⁶ volt with respect to ground. In a lightening
- The minimum velocity (in ms⁻¹) with which a car driver must traverse a flat curve
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