Chemistry 9th Chap 3 : Topic 6 - Maryam Publications

Chemistry Chapter 3 : Topic 6

Charged Particles in Electric Fields

1 / 20

A beam of charged particles enters a region where a uniform electric field is applied horizontally from left to right. Which statement correctly describes the motion of positively charged particles?

A) They move straight without deflection because the field is uniform

B) They experience a force in the direction of the field and follow a curved path

C) They accelerate in the direction opposite to the field

D) They remain stationary due to balanced forces

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When negatively charged particles enter a uniform electric field directed upward, what will be the direction of their deflection?

A) Downward opposite to the field

B) Straight without deflection

C) Circular motion

D) Upward along the field

3 / 20

A charged particle moves perpendicular to a uniform electric field. Which path will it most likely follow?

A) Straight line with constant velocity

B) Parabolic path due to constant acceleration

C) Zigzag motion due to changing force

D) Circular path due to constant force

4 / 20

Which statement best explains why particles follow curved paths in an electric field instead of straight lines?

A) The force due to the electric field acts continuously on the particle

B) The electric field changes direction randomly

C) The field only acts at specific points

D) The particle loses its charge during motion

5 / 20

Two particles, one positively charged and one negatively charged, enter the same uniform electric field with identical speeds. How will their paths compare?

A) Both curve in the same direction

B) Only the positive particle curves

C) Both follow identical straight paths

D) They curve in opposite directions

6 / 20

A beam of electrons passes through a uniform electric field between two parallel plates. Which statement correctly describes their motion?

A) They move in a circular orbit

B) They move toward the negative plate with constant speed

C) They move toward the positive plate with a curved path

D) They remain unaffected by the field

7 / 20

If the strength of the electric field increases, what will be the effect on the path of a charged particle?

A) Path becomes less curved

B) Particle stops moving

C) No change in motion

D) Path becomes more curved due to increased force

8 / 20

Which factor does NOT affect the degree of deflection of a charged particle in a uniform electric field?

A) Color of the particle

B) Mass of particle

C) Strength of electric field

D) Magnitude of charge

9 / 20

A proton enters a uniform electric field horizontally while the field is vertical. What type of motion will it exhibit?

A) Parabolic motion

B) Random motion

C) Straight-line motion

D) Uniform circular motion

10 / 20

Which statement best compares the paths of a proton and an electron in the same electric field?

A) Electron deflects more due to smaller mass

B) Proton deflects more due to larger mass

C) Neither deflects

D) Both deflect equally

11 / 20

Why does a charged particle accelerate in a uniform electric field?

A) Due to gravitational force

B) Due to electric force acting on charge

C) Due to friction with air

D) Due to magnetic interaction

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If a particle enters the electric field parallel to the field direction, what will be its motion?

A) It will not move

B) It will move in a straight line with changing speed

C) It will move in a circular path

D) It will oscillate

13 / 20

Which situation will produce no deflection of a charged particle in an electric field?

A) Particle moves perpendicular to field

B) Particle has zero charge

C) Field is very strong

D) Particle is very light

14 / 20

A negatively charged particle enters a uniform electric field with high speed. Compared to a slower particle, its path will be:

A) Circular

B) More curved

C) Identical

D) Less curved

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Which statement correctly explains the direction of force on a charged particle in an electric field?

A) Always opposite to field

B) Always toward the center of field

C) Independent of charge

D) Same as field for positive, opposite for negative

16 / 20

If the electric field between two plates is reversed, what happens to the path of a charged particle?

A) Particle stops moving

B) Direction of deflection reverses

C) Path remains unchanged

D) Path becomes straight

17 / 20

Which particle will show maximum curvature in a uniform electric field if all enter with same velocity?

A) Neutral particle

B) Particle with largest mass

C) Particle with zero velocity

D) Particle with smallest mass and largest charge

18 / 20

Why do charged particles not follow circular paths in a uniform electric field?

A) Charge becomes neutral

B) Particles lose energy

C) Force is not perpendicular to velocity at all times

D) Field is not strong enough

19 / 20

A particle moves in a straight line even in presence of electric field. What could be the reason?

A) Motion is parallel to field

B) Particle is neutral

C) All of the above

D) Field is absent

20 / 20

Which conclusion best summarizes the behavior of charged particles in a uniform electric field?

A) Only electrons are affected

B) Motion depends only on mass

C) All particles move in straight lines

D) Path depends on charge, mass, velocity, and field strength

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