Certain galvanometers have a fixed core made of non magnetic metallic material. The function of this metallic material is
Show Hint
Eddy currents in metallic cores are used for damping in galvanometers
- to oscillate the coil in magnetic field for longer period of time
- to produce large deflecting torque on the coil
- to make the magnetic field radial
- to bring the coil to rest quickly
The Correct Option is D
Solution and Explanation
Step 1: Analyze the role of the metallic core.
- Anon-magnetic metallic core produces eddy currents, which create a damping force.
- This damping force brings the coil to rest quickly.
Final Answer: The function is to bring the coil to rest quickly.
Top Questions on the earth's magnetic field
- If the earth's magnetic field at a certain place has a horizontal component of $ 5 $ gauss and a total field of $ 13 $ gauss, then the angle of dip at that place is:
- AP EAPCET - 2025
- Physics
- the earth's magnetic field
- The Earth's magnetic field originates from convection in which one of the following layers?
- GATE GG - 2024
- Geology and Geophysics
- the earth's magnetic field
- The Earth's magnetic field originates from convection in which one of the following layers?
- GATE GG - 2024
- Geology
- the earth's magnetic field
- Which among the following is denoted by $ \delta $?
- JKCET - 2024
- Physics
- the earth's magnetic field
- The ratio of radii of the circular paths of a proton and a deuteron when projected perpendicular to the direction of a uniform magnetic field with the same speed is
- KEAM - 2024
- Physics
- the earth's magnetic field
Questions Asked in JEE Main exam
- The system of linear equations
$x + y + z = 6$
$2x + 5y + az = 36$
$x + 2y + 3z = b$
has- JEE Main - 2026
- Matrices and Determinants
- The displacement of a particle executing simple harmonic motion with time period \(T\) is expressed as \[ x(t)=A\sin\omega t, \] where \(A\) is the amplitude of oscillation. If the maximum value of the potential energy of the oscillator is found at \[ t=\frac{T}{2\beta}, \] then the value of \(\beta\) is ________.
- JEE Main - 2026
- Waves and Oscillations
- A complex number 'z' satisfy both \(|z-6|=5\) & \(|z+2-6i|=5\) simultaneously. Find the value of \(z^3 + 3z^2 - 15z + 141\).
- JEE Main - 2026
- Algebra
In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$)
- JEE Main - 2026
- Rotational Mechanics
Two circular discs of radius \(10\) cm each are joined at their centres by a rod, as shown in the figure. The length of the rod is \(30\) cm and its mass is \(600\) g. The mass of each disc is also \(600\) g. If the applied torque between the two discs is \(43\times10^{-7}\) dyne·cm, then the angular acceleration of the system about the given axis \(AB\) is ________ rad s\(^{-2}\).
- JEE Main - 2026
- Rotational motion