Answer :
In electrostatics, electric charges are based on a fundamental unit of charge, which is 1.60×10^-19 C. Of the given options, only (c) 6.25 and (d) 1.60 elementary charges represent possible quantities of electric charge.
The question relates to electrostatics, the study of stationary electric charges or fields as opposed to electric currents. The magnitudes of electric charges are quantized, meaning they are always integral multiples of a fundamental unit of charge, which for electrons and protons is approximately 1.60×10-19 C.
Given the values in the question, we can identify which of the quantities represent a possible amount of excess electric charge on an object. The correct answer has to be a multiple of the elementary charge, which is 1.60×10-19 C. Therefore, option c) 6.25 elementary charges and option d) 1.60 elementary charges could represent real values for excess electric charge, since both numbers are integers when expressed in terms of the elementary charge.
Options a) and b) could not represent actual excess electric charge because their values are not multiples of the elementary charge.
