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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
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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 cricket ball of mass 250 g collides with a bat with velocity 10 m/s
- A 220 volts input is supplied to a transformer. The output circuit draws
- A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
- A coil has resistance 30 ohm and inductive reactance 20 ohmn at 50 Hz frequency.
- A body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature
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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