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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?

WBJEEWBJEE 2006

Solution:

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