| ⇦ | 
| ⇨ |
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: - The unit of permitivity of free space, ε₀ is
- An electron in hydrogen atom makes a transition n₁ → n₂
- Two discs of same material and thickness have radii 0.2 m and 0.6 m.
- The period of oscillation of a mass M suspended from a spring of negligible mass is T
- A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The unit of permitivity of free space, ε₀ is
- An electron in hydrogen atom makes a transition n₁ → n₂
- Two discs of same material and thickness have radii 0.2 m and 0.6 m.
- The period of oscillation of a mass M suspended from a spring of negligible mass is T
- A beaker of radius 1.5 cm is filled with a liquid of surface tension 0.075 N/m
Topics: Magnetic Effects of Current and Magnetism (167)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply