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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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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The near point and far point of a person are 40 cm and 250 cm, respectively.
- The electromagnetic waves detected using a thermopile and used in physical therapy
- The radius of gyration of a solid sphere of radius r about a certain axis is r
- The conducting loop in the form of a circle is placed in a uniform magneitc field
- In a pure capacitive A.C circuit, current and voltage differ in phase by
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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