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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
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two stones of masses m and 2m are whirled in horizontal circles, the heavier one
- Three cells, each of e.m.f 1.5 V and internal resistance 1 ohm are connected in parallel
- A carbon film resistor has colour code green, black, violet, gold. The value
- A parallel plate air capacitor is connected to battery. After charging fully
- A block of mass m moving at a velocity v collides with another block of mass 2m
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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