Physics
The nature of fuse wire is

High resistance and low melting point.
High resistance and high melting point.
Low resistance and high melting point.
Low resistance and low melting point.

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

The wavelength of electrons is smaller as compared to the wavelength of visible light
The electrons have more energy than the light particles
It uses more powerful lenses
The velocity of electron is smaller than that of visible light

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