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Voltage and Current - Technical MCQs

Q1:

Which is the smallest?

A atom

B proton

C neutron

D electron

ANS:D - electron

You are right Amuthan. The question is about its radius not the mass or charge.

Radius of Neutron: 1.113284057367 x10^-15 m
Radius of proton : 1.112772961016 x10^-15 m
Radius of electron: 9.087345835484 x10^-17 m

So, electron is the smallest.