What evidence from J.J. Thomson's experiments with the cathode ray led to the plum pudding model of the atom?

Question

The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.
The beam was attracted to a negative charge and repelled by a positive charge, showing that atoms contain small, positively charged particles.
The beam was positively charged and had significant mass, showing that atoms have a positive, dense nucleus.
The beam was neutral and had significant mass, showing that atoms contain neutral particles in the nucleus.

Answer 1

The correct evidence from J.J. Thomson's experiments with cathode rays that led to the plum pudding model of the atom is:

The beam was attracted to a positive charge and repelled by a negative charge, showing that atoms contain small, negatively charged particles.

Thomson's experiments demonstrated that cathode rays are composed of small, negatively charged particles (later named electrons). This finding implied that atoms must contain these negatively charged particles embedded within a positively charged "soup," leading to the formulation of the plum pudding model of the atom.