| ⇦ | 
| ⇨ |
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: - The first line in Lyman series has wavelength λ. The wavelength
- A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
- A bullet comes out of the barrel of gun of length 2m with a speed of 800 m/s
- A bus is moving with a speed of 10 ms⁻¹ on a straight road
- An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The first line in Lyman series has wavelength λ. The wavelength
- A wheel of mass 10 kg has a moment of inertia of 10 kgm² about its own axis
- A bullet comes out of the barrel of gun of length 2m with a speed of 800 m/s
- A bus is moving with a speed of 10 ms⁻¹ on a straight road
- An electron revolves in a circle at the rate of 10¹⁹ rounds per second.
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