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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
- If the sodium light in Young’s double slit experiment is replaced by red light
- A tangent galvanometer has a coil of 50 turns and a radius of 20 cm. The horizontal
- The S.I. unit of electric flux is
- A coil of resistance and 1.0 H inductance is connected to an a.c. source of frequency
- Two resistors of resistances 2Ω and 6Ω are connected in parallel.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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