Ch 20 Review

If a unit positive charge is taken from one point to another over an equipotential surface, then

• Work is done on the charge

• Work is done by the charge

• Work done is constant

• No work is done

Angle between equipotential surface and lines of force is

• 0

• 180

• 90

• 45

Two charge +Q and -Q are situated at a certain distance. At the point exactly midway between them

• Electric field and potential both are zero

• Electric field is zero but potential is not zero

• Electric field is not zero but potential is zero

• Neither electric field nor potential is zero

Two positive charges of magnitude q are each a distance d from the origin A of a coordinate system as shown above. At which of the following points is the electric potential greatest in magnitude?

• A

• B

• C

• D

• E

The capacitance of a parallel-plate capacitor can be increased by increasing which of the following?

• The distance between the plates

• The charge on each plate

• The area of the plates

• The potential difference across the plates

• None of the above

How can a neutral object become charged?

• by being dipped in water

• by being stuck to the desk with tape

• by allowing gravity to work on it

• by having electrons added or removed

Based on the arrangement of the electric field lines in the diagram, what are the charges?

• both charges are the same

• the charges are opposite

• they are neutral; no charge

Which statement best describes the electric fields in the image?

• The charges are neutral.

• Both charges are negative, so the field lines are alike.

• The field lines move toward a positive charge and away from a negative charge.

• The field lines move away from a positive charge and toward a negative charge.

Which statement describes what is happening in the image at the space indicated by the green arrow?

• The field lines are repelled by like charges.

• The field lines are repelled by opposite charges.

• The field lines are attracted by the like charges.

• The field lines are attracted by the opposite charges.

Where can an electric field be found?

• below a force field

• in a gravitational field

• in the space surrounding a charged object

• outside of a magnetic field