# Which Statements About Electric Field Lines Are True?

• ss883
In summary, the electric field is always perpendicular to the surface outside of a conductor, it is not possible for the electric field to ever be zero, it is possible for two electric field lines to cross each other, and if an electron were placed on an electric field line, it would move in a direction perpendicular to the field.
ss883
Which, if any, of the following statements about electric field lines is/are true?

• The electric field is always perpendicular to the surface outside of a conductor. - TRUE
• It is not possible for the electric field to ever be zero. - FALSE
• It is possible for two electric field lines to cross each other. - FALSE
• If an electron were placed on an electric field line, it would move in a direction perpendicular to the field. - NOT SURE
• If a proton were placed on an electric field line, it would move in a direction anti-parallel to the field. - NOT SURE
• If an electron and a positron were in the presence of a very strong electric field, they would move away from each other. - NOT SURE
• Electric field lines originate on positive charge and terminate on negative charge. - TRUE

I do not completely understand the movement of particles through an electric field. How to electrons and positrons move? What are the answers to the questions I'm not sure about?

"If an electron were placed on an electric field line, it would move in a direction perpendicular to the field."

Have you worked with electrostatics before? Do you know conceptually what happens to an electron when it's being subject to an electric field? If electric forces are hard for you to visualize try and make a similar analogy to magnets

"If a proton were placed on an electric field line, it would move in a direction anti-parallel to the field."

Same reasoning as what I said above. Again, think of them as magnets if it helps you visualize it better.

The last one you have to think about the forces acting on the particles. In this case it's a 'really strong electric field'. I would assume that any force from this field would outweigh any force between the two particles.

You are aware of how the electric field is defined - use it to determine the motion of a charged particle in a field. For example, a negatively charged particle like an electron will move to a higher potential, i.e. a direction opposite (anti parallel) to the field lines.

What kind of charge does an electron have? Is it positive? -or- Is it negative?

force on electron will will cause its motion and the direction that force depends on electric field ... so what it should be now?

## 1. What are electric field lines?

Electric field lines are imaginary lines that represent the direction and strength of an electric field at different points in space.

## 2. How are electric field lines drawn?

Electric field lines are drawn such that they are perpendicular to the surface of a charged object and are closer together in areas of higher electric field strength.

## 3. Do electric field lines ever cross?

No, electric field lines do not cross each other. This is because the electric field can only have one direction at any given point in space.

## 4. Can electric field lines tell us about the magnitude of the electric field?

Yes, the closer the electric field lines are to each other, the stronger the electric field is at that point. Additionally, the number of electric field lines per unit area is directly proportional to the strength of the electric field.

## 5. What happens to electric field lines when they encounter a conductor?

When electric field lines encounter a conductor, they are perpendicular to the surface of the conductor and do not penetrate into the conductor. This is due to the fact that conductors have free electrons that can move and redistribute the electric field within the conductor.

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