Which of the following are the properties of an electron? 1. Electron is a constituent of cathode ray 2. Electron is a negatively charged particle 3. The mass of the electron is equal to the mass of the proton 4. Electron is deflected by the electric field but not by magnetic field Select the correct answer using the code given below:

Electrons are fundamental subatomic particles discovered by J.J. Thomson through cathode ray experiments [2]. Statement 1 is correct as cathode rays are streams of negatively charged particles identified as electrons. Statement 2 is correct because electrons carry a negative charge of approximately 1.6 x 10⁻¹⁹ C. Statement 3 is incorrect; the mass of an electron (9.1 x 10⁻³¹ kg) is significantly smaller than that of a proton (1.67 x 10⁻²⁷ kg), being roughly 1/1837th the mass of a hydrogen atom. Statement 4 is incorrect because electrons, being charged particles, are deflected by both electric and magnetic fields [1]. Specifically, they bend toward positive plates in electric fields and experience a force perpendicular to their velocity in magnetic fields. Therefore, only statements 1 and 2 are accurate properties of electrons.

Sources

1. [2] https://en.wikipedia.org/wiki/Cathode_ray
2. [1] Science , class X (NCERT 2025 ed.) > Chapter 12: Magnetic Effects of Electric Current > EXERCISES > p. 207