| ⇦ | 
| ⇨ |
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 threshold wavelength for photoelectric emission from a material is 4800 Å.
- A uniform force of (3i+j) Nacts on a particle of mass 2 kg.Hence the particle is displaced
- The body of mass m hangs at one end of a string of length l, the other end of which
- Two charged spheres seperated at a distance d exert a force F on each other.
- Number of electrons in one mC charge, given e=1.6×10⁻¹⁹ C, will be
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The threshold wavelength for photoelectric emission from a material is 4800 Å.
- A uniform force of (3i+j) Nacts on a particle of mass 2 kg.Hence the particle is displaced
- The body of mass m hangs at one end of a string of length l, the other end of which
- Two charged spheres seperated at a distance d exert a force F on each other.
- Number of electrons in one mC charge, given e=1.6×10⁻¹⁹ C, will be
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