Physics
If a body moves with a constant speed in a circle

No force acts on it
No acceleration is produced in it
No work is done on it
Its velocity remains constant

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

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

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