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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
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Assuming the sun to have a spherical outer surface of radius r
- A black body at 227⁰C radiates heat at the rate of 7cals/cm²s. At a temperature
- The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma
- The dimensional formula for Young’s modulus is
- If a nucleus ᴢXᴬ emits 9α and 5β-particles, then the ratio of total protons and neutrons
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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