| ⇦ | 
| ⇨ |
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: - When a mass m is attached to a spring, it normally extends by 0.2 m.
- A coil of resistance 10 Ω and an inductance 5 H is connected to a 100 volt
- The ratio of the radii or gyration of a circular disc to that of a circular ring
- Water rises in a vertical capillary tube up to a height of 2.0 cm.
- The maximum number of possible interference maxima for slit-seperation equal to
Topics: Magnetic Effects of Current and Magnetism
(167)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When a mass m is attached to a spring, it normally extends by 0.2 m.
- A coil of resistance 10 Ω and an inductance 5 H is connected to a 100 volt
- The ratio of the radii or gyration of a circular disc to that of a circular ring
- Water rises in a vertical capillary tube up to a height of 2.0 cm.
- The maximum number of possible interference maxima for slit-seperation equal to
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