Behaviours of Charge Particles in Electric Field

Question 1: What is the state of the metal-coated polystyrene ball when the power supply is switched on and the ball is positioned between two charged metal plates, but remains neutral?

• A) It swings to and fro between the plates.

• B) It moves towards the positively charged plate.

• C) It moves towards the negatively charged plate.

• D) It does not move.

Question 2: When the polystyrene ball touches the negatively charged metal plate, what is the immediate effect on the ball's charge and subsequent motion?

• A) Positive charges are transferred from the ball to the plate, making the ball positively charged and attracted to the negative plate.

• B) Positive charges of the ball are discharged, making the ball negatively charged and repelled by the negative plate.

• C) Electrons are transferred from the plate to the ball, making the ball negatively charged and attracted to the positive plate.

• D) Electrons are transferred from the ball to the plate, making the ball positively charged and repelled by the negative plate.

question 3: Which of the following statements correctly describes the interaction when the negatively charged polystyrene ball is between the two plates?

• A) It is attracted to the positive metal plate because like charges repel.

• B) It is repelled by the positive metal plate because unlike charges attract.

• C) It is attracted to the positive metal plate because unlike charges attract.

• D) It is repelled by the negative metal plate because unlike charges attract.

When a neutral metal-coated polystyrene ball is placed between two charged metal plates with the power supply switched on, the ball typically ________ because it is neutral.

• A) swings to and fro

• B) moves towards the positive plate

• C) does not move

• D) moves towards the negative plate

Question 5: When the positively charged polystyrene ball touches the negatively charged metal plate, ________ charges of the ball will be discharged, and the ball will become ________ charged.

• A) negative, positively

• B) positive, negatively

• C) positive, positively

• D) negative, neutral

What happens to the candle flame when the power supply is switched on in the presence of two metal plates?

• A) It becomes larger and moves towards the positive plate.

• B) It spreads out between the two metal plates.

• C) It extinguishes due to the electric field.

• D) It only spreads towards the positive plate.

What is the primary reason the candle flame spreads out when the power supply is switched on?

• A) The heat from the candle flame increases.

• B) Air in the surrounding of the flame ionizes.

• C) The metal plates become hotter.

• D) The candle wax melts faster.

When the air from the candle flame ionizes, what types of particles are formed?

• A) Only positive ions.

• B) Only negative ions.

• C) Both positive and negative ions.

• D) Neutral atoms.

Which statement correctly describes the movement of ions in the electric field?

• A) Negative ions are attracted to the negatively charged metal plate.

• B) Positive ions are attracted to the positively charged metal plate.

• C) Negative ions are attracted to the positively charged metal plate, while positive ions are attracted to the negatively charged metal plate.

• D) Both positive and negative ions are attracted to the positive metal plate.

Why is the spread of flames towards the negatively charged metal plate greater than towards the positively charged metal plate?

• A) Negative ions are heavier than positive ions.

• B) Positive ions have larger mass and size compared to negative ions.

• C) The negative plate has a stronger charge.

• D) The candle flame naturally leans towards the negative plate.