Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
206 views
in Electronics by (239k points)
closed by
In a d’Arsonval galvanometer an iron core is usually used between the permanent magnet pole faces. This is used so that:
1. The effect of stray magnetic field is reduced
2. Moment of inertia of moving parts become smaller
3. Cost of production is reduced
4. Flux density in the air gap becomes high thereby a large deflecting torque is produced

1 Answer

0 votes
by (237k points)
selected by
 
Best answer
Correct Answer - Option 4 : Flux density in the air gap becomes high thereby a large deflecting torque is produced

D’Arsonval Galvanometer: Used to measure small voltage and current in the circuit.

It is a center zero value measuring instrument.

Advantages of placing iron core between the permanent magnet pole faces:

  • Provides the uniform air gap between the coil sides and pole faces.
  • Reduces the gap between coil sides and pole faces of the coil. Therefore it increases the magnetic linkage with the coil.
  • The sensitivity of the D’Arsonval galvanometer increases.
  • The deflection torque of the coil is directly proportional to the current through it. Therefore we can obtain a uniform scale of the instrument.

Related questions

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...