Question

Cathode rays consist of

• A. Protons
• B. Electrons
• C. Neutrons
• D. None of these

Answer 1

The correct option is B

Electrons

Let's try to analyze the effect of Electric field and magnetic field on cathode rays:

Effect of electric field: When an electric field is applied to a stream of cathode rays, they get deflected towards the positive plate. It shows that cathode rays are themselves negatively charged.

Effect of magnetic field: When a magnetic field is applied perpendicular to the path of cathode rays, they get deflected in the direction expected for negative particles. This further confirms that cathode rays are negatively charged.

$\Rightarrow$ Therefore, we can conclude that cathode rays consist of electrons.