PHY 3

If a uniform electric field (E) acts perpendicularly through a plane with area (A), what is the electric flux (ΦE) through the plane?

• ΦE = E / A

• ΦE = E + A

• ΦE = E A

• ΦE = E - A

What does electric flux measure?

• The strength of the electric field.

• The amount of electric field passing through a given area.

• The direction of the electric field.

• The potential difference across a surface.

What happens to the number of electric field lines passing through a plane as it rotates from a position perpendicular to the electric field?

• It increases.

• It remains constant.

• It decreases.

• It first increases then decreases.

How is the area vector for a 2D surface defined?

• It is parallel to the surface and its magnitude is the perimeter.

• It is perpendicular to the surface and its magnitude is the area.

• It is parallel to the electric field lines.

• It is a scalar quantity with no direction.

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Is electric flux a scalar or vector quantity?

• Scalar quantity

• Vector quantity

• Both scalar and vector

• Neither scalar nor vector