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A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively
Options
(a) both remain the same
(b) 1.1 times, 1.1 times
(c) 1.2 times, 1.1 times
(d) 1.21 times, same
Correct Answer:
1.21 times, same
Explanation:
Δl / l = 0.1 , Therefore, l = 1.1 but the area also decreases by 0.1.
mass = ρlA = Vρ. In l + In A = 1n mass.
.·. Δl / l = ΔA / A = 0 ⇒ Δl / l = -ΔA / A
Length increases by 0.1, resistance increases, area decreases by 0.1, then also resistance will increase. Total increase in resistance is approximately 1.2 times, due to increase in length and decrease in area. But specific resistance does not change.
Related Questions: - A battery having e.m.f. 4 volt and internal resistance 0.5 Ω is connected
- An object is attached to the bottom of a light vertical spring and set vibrating.
- Two cities are 150 km apart. Electric power is sent from one city to another city
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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
- An object is attached to the bottom of a light vertical spring and set vibrating.
- Two cities are 150 km apart. Electric power is sent from one city to another city
- The core of a transformer is laminated because
- A remote-sensing satellite of earth revolves in a circular orbit at a height
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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