| ⇦ | 
| ⇨ |
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: - Three capacitors each of capacity 4 μF are to be connected in such a way that the effective
- Which of the following, is a vector quantity?
- The magnetic susceptibility does not depend upon the temperature in
- Volume of gas becomes four times if temperature becomes
- If a carnot engine is working with source temperature at 227⁰C and sink
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Three capacitors each of capacity 4 μF are to be connected in such a way that the effective
- Which of the following, is a vector quantity?
- The magnetic susceptibility does not depend upon the temperature in
- Volume of gas becomes four times if temperature becomes
- If a carnot engine is working with source temperature at 227⁰C and sink
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