A current of 2A flows through a 2Ω resistor when connected across a battery

A Current Of 2a Flows Through A 2 Resistor When Physics Question

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:

  1. A stationary particle explodes into two particles of masses m₁ and m₂ which move
  2. A coil of resistance 20 ohm and inductance 5H is connected with a 100V battery
  3. A,B and C are voltmeters of resistance R, 1.5 R and 3R respectively, as shown
  4. A glass slab consists of thin uniform layers of progressively decreasing refractive
  5. In Bohr model of hydrogen atom, the force on the electron depends on the principal

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*