Question

charges and fields simulation

1. open \charges and fields\ simulation.
2. drag a positive point charge over. draw the electric field lines. drag it back.
3. drag a negative point charge over. draw the electric field lines.
4. place a positive and negative charge about 200cm away from each other. draw the electric field lines.
5. place two positive charges about 200 cm away from each other. draw the electric field lines.
6. place two negative charges about 200 cm away from each other. draw the electric field lines.

Explanation:

Electric field lines of a single positive charge

$$ \vec{E} = \frac{k q}{r^2} \hat{r} $$

The electric field lines point radially outward from the positive charge in all directions.

Electric field lines of a single negative charge

$$ \vec{E} = -\frac{k q}{r^2} \hat{r} $$

The electric field lines point radially inward toward the negative charge from all directions.

Electric field lines of an electric dipole

The electric field lines originate on the positive charge and terminate on the negative charge, curving smoothly from the positive to the negative charge.

Electric field lines of two positive charges

The electric field lines emerge radially from both positive charges and bend away from each other, creating a neutral point with zero field directly between them.

Electric field lines of two negative charges

The electric field lines point radially inward toward both negative charges, bending away from each other with a neutral point of zero field directly between them.

Answer:

Question 2

The electric field lines point radially outward in all directions from the positive charge.

Question 3

The electric field lines point radially inward from all directions toward the negative charge.

Question 4

The electric field lines start on the positive charge and curve smoothly to end on the negative charge.

Question 5

The electric field lines point outward from both positive charges, bending away from each other so that no lines cross the midpoint between them.

Question 6

The electric field lines point inward toward both negative charges, bending away from each other so that no lines cross the midpoint between them.