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A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection for 30 mA current. It is to work as a voltmeter of 30 volt range, the resistance required be added will be
Options
(a) 900Ω
(b) 1800Ω
(c) 500Ω
(d) 1000Ω
Correct Answer:
900Ω
Explanation:
Let the resistance to be added be R, then
30 = Ig (r + R)
R = 30 / Ig – r = 30 / 30 x 10⁻³ – 100
1000 – 100 = 900Ω
Related Questions: - A projectile is thrown in the upward direction making an angle of 60°with the horizontal
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Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A projectile is thrown in the upward direction making an angle of 60°with the horizontal
- For transistor action (1) Base, emitter and collector regions should have similar size
- The moderator in a reactor
- The equivalent resistance of two resistors connected in series is 6 Ω
- A carnot engine working between 300 K and 600 K has a work output of 800J per cycle.
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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