Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised

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Physics
To resolve an object in an electron microscope,

None of these
Both A & B
The wavelength of the electrons must be greater than the diameter of the object.
The wavelength of the electrons must be close to the diameter of the object

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