Physics 2

Gauss's law may be applied only to charge distributions that are symmetric. True False

False

If the net flux through a closed surface is zero, then there can be no charge or charges within that surface. True False

False

Is it possible to have a zero electric field value between a negative and positive charge along the line joining the two charges? Yes, regardless of the magnitude of the two charges. Yes, if the two charges are equal in magnitude. No, a zero electric field cannot exist between the two charges. cannot be determined without knowing the separation between the two charges cannot be determined without knowing the magnitude of the charges

No, a zero electric field cannot exist between the two charges.

A net charge is placed on a hollow conducting isolated sphere. How does the net charge distribute itself? The net charge uniformly distributes itself throughout the thickness of the conducting sphere. The net charge uniformly distributes itself on the sphere's inner surface. The net charge clumps together at some location within the sphere. The net charge uniformly distributes itself on the sphere's inner and outer surfaces. The net charge uniformly distributes itself on the sphere's outer surface.

The net charge uniformly distributes itself on the sphere's outer surface.

Gaussian surfaces A and B enclose the same positive point charge. The area of surface A is two times larger than that of surface B. How does the total electric flux through the two surfaces compare? The total electric flux through surface A is eight times larger than that through surface B. The total electric flux through the two surfaces is equal. The total electric flux through surface B is four times larger than that through surface A. The total electric flux through surface B is eight times larger than that through surface A. The total electric flux through surface A is four times larger than that through surface B.

The total electric flux through the two surfaces is equal.

A solid conducting sphere is placed in an external uniform electric field. With regard to the electric field on the sphere's interior, which statement is correct? The interior field points in a direction perpendicular to the exterior field. The interior field points in a direction parallel to the exterior field. The interior field points in a direction opposite to the exterior field. There is no electric field on the interior of the conducting sphere.

There is no electric field on the interior of the conducting sphere.

A positive charge placed in an electric field experiences a force in the direction of the field. True or False

True

If a closed surface surrounds a dipole, the net flux through the surface is zero. True False

True

If the net flux through a closed surface is positive, then the net charge enclosed must be positive. True False

True

Is it possible to have a zero electric field value between two positive charges along the line joining the two charges? No, a zero electric field cannot exist between the two charges. Yes, if the two charges are equal in magnitude. Yes, regardless of the magnitude of the two charges. cannot be determined without knowing the separation between the two charges cannot be determined without knowing the magnitude of the charges

Yes, regardless of the magnitude of the two charges.

An atom has more electrons than protons. The atom is a positive ion. an insulator. a conductor. a semiconductor. a negative ion.

a negative ion

If two uncharged objects are rubbed together and one of them acquires a positive charge then the other one acquires a negative charge. may or may not acquire a negative charge. may or may not acquire a positive charge. remains the same. also acquires a positive charge.

acquires a negative charge

Outside a spherically symmetric charge distribution of net charge Q, Gauss's law can be used to show that the electric field at a given distance must be directed outward. must be directed inward. must be zero. acts like it is formed by a point charge Q at the center of the distribution. must be greater than zero.

acts like it is formed by a point charge Q at the center of the distribution.

Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as insulators. semiconductors. conductors. superconductors. polar.

conductors

The direction of the electric field halfway between an electron and a proton is undefined since the electric field is zero. perpendicular to the line from the electron to the proton. directed toward the electron. directed toward the proton. cannot be determined.

directed toward the electron

Materials in which the electrons are bound very tightly to the nuclei are referred to as superconductors. insulators. semiconductors. polar. conductors.

insulators

An originally neutral electroscope is grounded briefly while a positively charged glass rod is held near it. After the glass rod is removed, the electroscope is positively charged. is negatively charged. remains neutral. could be either positively or negatively charged, depending on how long the contact with ground lasted.

is negatively charged

If an electroscope is charged by induction its leaves will remain attached. it will acquire a negative charge. its leaves will separate because of the interaction of the charges. nothing will happen since electroscopes require being charged by conduction. it will acquire a positive charge.

its leaves will separate because of the interaction of the charges.

A negatively charged rod is brought near one end of an uncharged metal bar. The end of the metal bar farthest from the charged rod will be charged positive. negative. neutral. none of the given answers

negative

An advantage in evaluating surface integrals related to Gauss's law for symmetric charge distributions is the flux is outward. the charge is always on the surface. the electric field is of constant magnitude on certain surfaces. the flux is inward. the electric field is a constant on any surface.

the electric field is of constant magnitude on certain surfaces.

When five equal positive charges are uniformly spaced along the x-axis, the force on the next to last charge on the right is directed zero. possibly in the negative y-direction. to the right. to the left. possibly in the positive y-direction.

to the right.