Introduction:
When a charged particle is placed in an electric field, it experiences a force due to the presence of electric lines of force. These lines represent the direction and magnitude of the electric field. However, it is important to note that the motion of the charged particle depends on various factors, and it may not always move along the electric lines of force.

Factors affecting the motion:
Several factors influence the motion of a charged particle in an electric field. Let's discuss them in detail:

1. Initial Velocity:
The initial velocity of the charged particle determines its trajectory. If the particle has an initial velocity component perpendicular to the electric lines of force, it will move in a curved path rather than along the lines of force.

2. Angle of Incidence:
The angle at which the charged particle enters the electric field also affects its subsequent motion. If the particle enters at an angle other than parallel or perpendicular to the electric lines of force, it will experience a force component perpendicular to its velocity, causing it to deviate from the original path.

3. External Forces:
The presence of external forces, such as gravitational force or magnetic force, can also influence the motion of the charged particle. These forces may act in different directions, causing the particle to deviate from the electric lines of force.

4. Non-Uniform Electric Field:
In a non-uniform electric field, the electric lines of force are not evenly spaced. As a result, the charged particle experiences varying forces along its path. This can cause the particle to deviate from the electric lines of force.

Conclusion:
In conclusion, while a charged particle in an electric field tends to experience a force along the electric lines of force, it does not always move exclusively along these lines. Factors such as initial velocity, angle of incidence, external forces, and the non-uniformity of the electric field can cause the charged particle to deviate from its original path. Therefore, the motion of a charged particle in an electric field can be influenced by various factors and may not always align with the electric lines of force.