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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
- Steam at 100⁰C is passed into 20 g of water at 10°C. When water acquires a temperature
- A radiactive substance emits 100 beta particles in the first 2s and 50 beta
- An aeroplane is flying horizontally with a velocity of 216 km/h at a height of 1960 m.
- Electric field intensity at a point in between two parallel sheets due to like
- An explosion breaks a rock into three parts in a horizontal plane
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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