Which of the following does not affect the magnetic properties of a magnet?
Heat
Dropped from a height
Hammering
Painting
Applying a layer of non magnetic material doesn't have any effect on the magnetic strength of a magnet, given the thickness of the layer is small.
Which of the following does not affect the magnetic properties of a permanent magnet?
Which of the following does not affect the magnetic properties of a material?
Painting a magnet drastically reduces the magnetic properties.