JEE Main 20238 AprilMorning Shift
- Exam
- JEE Main
- Year
- 2023
- Date
- 8 April
- Shift
- Morning Shift
- Subject
- Physics
- Chapter
- Magnetic Properties of Matter
JEE Main 2023 · 8 April · Morning Shift · Physics · Magnetic Properties of Matter
Certain galvanometers have a fixed core made of non magnetic...
Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is
Options
- Ato oscillate the coil in magnetic field for longer period of time
- Bto bring the coil to rest quickly
- Cto produce large deflecting torque on the coil
- Dto make the magnetic field radial
Correct answer
B. to bring the coil to rest quickly
Step-by-step solution
Certain galvanometers have a fixed core made of nonmagnetic metallic material. When the coil oscillates, the eddy currents generated in the core oppose the motion and bring the coil to rest quickly. Eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor according to Faraday’s law of induction. Eddy currents flow in closed loops within conductors, in planes perpendicular to the magnetic field.