What is the purpose of the soft steel core in a PMMC galvanometer?
What is the purpose of the soft steel core in a PMMC galvanometer?
Right Answer is:
To reduce the total air gap between the magnetic poles
SOLUTION
The purpose of the soft iron core in a Permanent Magnet Moving Coil (PMMC) galvanometer is to to reduce the total air gap between the magnetic poles.
- Increases Magnetic Flux and Sensitivity: The soft iron core increases the magnetic flux linked and sensitivity. It is ferromagnetic and enhances the strength of magnetic lines of force.
- High Magnetic Permeability: Soft iron has higher magnetic permeability compared to steel, which helps in increasing the magnetic field.
- Easy Magnetization: Soft iron is easily magnetized.
- Shielding: A soft-iron yoke is used to complete the flux path and provide shielding from external stray fields.