The range of voltmeter is 10V and its internal resistance is 50Ω.

The Range Of Voltmeter Is 10v And Its Internal Resistance Physics Question

The range of voltmeter is 10V and its internal resistance is 50Ω. To convert it to a voltmeter of range 15V, how much resistance is to be added?

Options

(a) Add 25Ω resistor is parallel
(b) Add 25Ω resistor is series
(c) Add 125Ω resistor in parallel
(d) Add 125Ω resistor in series

Correct Answer:

Add 25Ω resistor is series

Explanation:

The current in case of voltmeter range 10 V and resistance 50 Ω is I = 10 / 50 —–(i)

Let X is the resistance conneced in order to make a voltmeter with range 15 V is I = 15 / X —-(ii)

Equating equation (i) and (ii), we get

15 / X = 10 / 50 ⇒ X = (15 × 50) = 75 Ω

Then, R = 75 – 50 = 25 Ω must be connected in series, because V ∝ R when current is constant.

Related Questions:

  1. Copper and carbon wires are connected in series and the combined resistor is kept
  2. A photoelectric surface is illuminated successively by monochromatic light of wavelength
  3. A planet moving along an elliptical orbit is closest to the sun at a distance of r₁
  4. Match the following columns about collision
  5. The angle between the two vectors A = 3i+4j+5k and B = 3i+4j-5k will be

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Your email address will not be published.


*