MENU

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. The friction of the air causes a vertical retardation equal to 10%
  2. A freely suspended bar magnet aligns itself in
  3. Consider two nuclei of the same radioactive nuclide. One of the nuclei was created
  4. If the sodium light in Young’s double slit experiment is replaced by red light
  5. Two lines of force due to a bar magnet

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Your email address will not be published.


*