Assertion: Cathode Rays get deflected towards the positive plate of electricfield.Reason: Cathode rays consist of negatively charged particles, known as electrons

Step 1: Understand the assertion and reason given in the question.

The assertion states that cathode rays get deflected towards the positive plate of an electric field.

The reason provided is that cathode rays consist of negatively charged particles, known as electrons.

Step 2: Analyze the assertion and reason.

The assertion suggests that the deflection of cathode rays towards the positive plate of an electric field is a known phenomenon.

The reason given supports the assertion by explaining that cathode rays are made up of negatively charged particles (electrons), which are attracted to the positive plate of the electric field.

Step 3: Evaluate the assertion and reason.

The reason provided supports the assertion. It is a well-known fact that cathode rays are composed of negatively charged particles (electrons), and these electrons are indeed attracted to the positive plate of an electric field.

Step 4: Determine the relationship between the assertion and reason.

The reason supports the assertion. The presence of negatively charged particles (electrons) in cathode rays explains why they are deflected towards the positive plate of an electric field.

Step 5: Provide the final answer.

The assertion is true, and the reason is a valid explanation for the assertion. Cathode rays, consisting of negatively charged particles (electrons), do get deflected towards the positive plate of an electric field.