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  4. Which one of the following has unit positive charge and 1 amu mass?

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Q. Which one of the following has unit positive charge and $1$ amu mass?

Rajasthan PMTRajasthan PMT 2006

Solution:

The proton has unit positive charge $\left(+1.602 \times 10^{-19}\right.$ coulombs) and its mass is $1.007 amu \left(1.677 \times 10^{-27} kg \right)$