| ⇦ | 
| ⇨ |
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: - Two blocks of masses m₁=4 kg and m₂= 2kg are connected to the ends of a string
- Point masses m₁ and m₂ are placed at the opposite ends of a rigid rod of length L,
- An object is attached to the bottom of a light vertical spring and set vibrating.
- A step-up transformer operates on a 230 V line and supplies a current of 2 A.
- An ideal gas is expanding such that PT²=constant. The coefficient of volume
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two blocks of masses m₁=4 kg and m₂= 2kg are connected to the ends of a string
- Point masses m₁ and m₂ are placed at the opposite ends of a rigid rod of length L,
- An object is attached to the bottom of a light vertical spring and set vibrating.
- A step-up transformer operates on a 230 V line and supplies a current of 2 A.
- An ideal gas is expanding such that PT²=constant. The coefficient of volume
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