Electric Charges and Fields: common misconceptions

If your child says… “Positive charge means extra electrons.”

Ask together

Which object lost negative charge?

What’s true

Gaining electrons makes an initially neutral object negative.

If your child says… “I just add both force sizes.”

Ask together

Does the right-hand charge help or oppose the left-hand charge’s push?

What’s true

Opposite forces subtract because they push in opposite directions.

If your child says… “Field lines cross where two fields meet.”

Ask together

If lines crossed here, which single direction would the positive charge’s force take?

What’s true

A nonzero resultant field has one direction at each point.

If your child says… “I measure the angle from the surface.”

Ask together

When the field runs along the surface, how much points through it?

What’s true

The flux angle is measured from the surface normal.

If your child says… “I use half the gap for the separation.”

Ask together

Where does the distance between the charges begin and end?

What’s true

Dipole moment uses the full distance between the charges.

If your child says… “Both forces add and push the dipole along.”

Ask together

Do the opposite pushes act at the same place?

What’s true

The forces cancel overall but can produce rotation.

If your child says… “The outside charge adds to net flux.”

Ask together

Where does the outside charge’s entering flux leave?

What’s true

Only enclosed net charge sets the total outward flux through a closed surface.

If your child says… “Inside the shell, I use the point-charge field.”

Ask together

What charge lies inside the smaller centred sphere?

What’s true

Spherical symmetry makes the shell’s field cancel everywhere inside.