Which of the following will not show deflection
Question:

Which of the following will not show deflection from the path on passing through an electric field?

Proton, cathode rays, electron, neutron

Solution:

Neutron will not show deflection from the path on passing through an electric field.

This is due to the neutral nature of the neutron particles. Therefore, it has no charge and does not get affected by any electric field.

Among other 3 particles proton (positive ), electron (negative), cathode rays (the beam of electrons, negatively charged) all have charges in them so they will get deflected easily by an electric field.