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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.
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The cadmium rods are used in nuclear reactor to
- Masses of 3 wires of same metal are in the ratio 1:2:3 and their lengths
- A simple pendulum has a time period T₁ when on the earth’s surface and T₂ When taken
- Which of the following is true for elastic potential energy density?
- The term liquid crystal refers to a state that is intermediate between
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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