# Electronics - Voltage and Current - Discussion

### Discussion :: Voltage and Current - General Questions (Q.No.44)

44.

Which is the smallest?

 [A]. atom [B]. proton [C]. neutron [D]. electron

Explanation:

No answer description available for this question.

 Sandeep said: (Dec 24, 2010) mass of proton & neutron = 1.678*10^-27. while that of electron is = 9.1*10^-31.

 Kulwinder said: (May 5, 2011) I agree with sandeep.

 Mukesh said: (Dec 6, 2011) @sandip:but mass of electon is 1.6*10^-19

 Ranjitha said: (Dec 21, 2011) @Mukesh:charge of electron=1.6*10^-19

 Jaggu said: (Jan 7, 2012) I agree with sandeep.

 Amuthan said: (Jun 2, 2012) Hello guys question is on radius not mass or charge. :).

 Satwant Singh said: (Jun 21, 2012) Which is the largest ?

 Praveen said: (Sep 18, 2012) 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.

 Mrunali said: (Jan 7, 2014) Just FYI. Mass of an electron is 9.1*10^-31 kg. Mass of a proton is 1.6*10^-27 kg. Charge of an electron is -1.6*10^-19 C. Charge of a proton is 1.6*10^-19 C.

 Sakthi Vel.S said: (Aug 8, 2014) Proton & neutron joint, so it was big size. But electron is separate.

 Xylene said: (Jul 2, 2016) How did you measure the radius of electrons? What I know is that electrons are waves.

 Jay said: (Aug 30, 2016) @Xylene : How can you say that?

 Mahesh said: (Jul 12, 2017) How did you calculate the radius of e & p & n?