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Two cells, having the same e.m.f. are connected in series through an external resistance R. Cells have internal resistances r₁ and r₂ (r₁ > r₂) respectively. When the circuit is closed, the potential difference across the first cell is zero. The value of R is
Options
(a) r₁ + r₂
(b) r₁ – r₂
(c) r₁ + r₂/2
(d) r₁ – r₂/2
Correct Answer:
r₁ – r₂
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A polarised light of intensity I₀ is passed through another polariser whose pass axis
- Changing magnetic fields can set up current loops in nearby metal bodies
- A radio isotope X with a half life 1.4 x 10⁹ years decays to Y which is stable
- Two tuning forks are sounded together and produce 2 beats per second.
- The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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