| ⇦ | 
| ⇨ |
A current of 2A flows through a 2Ω resistor when connected across a battery. The same battery supplies a current of 0.5A when connected across a 9Ω resistor. The internal resistance of the battery is
Options
(a) 0.5Ω
(b) 1/3Ω
(c) 1/4Ω
(d) 1Ω
Correct Answer:
1/3Ω
Explanation:
Let the internal resistance of the battery be r. Then the current flowing through the circuit is given by
i = E / R + r
In first case, 2 = E / 2 + r …(i)
In second case, 0.5 = E / 9 + r … (ii)
From (i) & (ii), 4 + 2r = 4.5 + 0.5r
1.5r = 0.5
r = 1/3Ω
Related Questions: - An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
- When a current of (2.5±0.5) A flows through a wire, it develops a potential difference
- A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
- A glass slab consists of thin uniform layers of progressively decreasing refractive
- A parallel plate air capacitor has capacity C, distance of seperation between plate
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
- When a current of (2.5±0.5) A flows through a wire, it develops a potential difference
- A radioactive substance emits n beta particles in the first 2 s and 0.5 n beta
- A glass slab consists of thin uniform layers of progressively decreasing refractive
- A parallel plate air capacitor has capacity C, distance of seperation between plate
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