Electric Charges and Fields Quiz

Resting charges create a magnetic field.

The smallest unit of charge is the Faraday.

What are the units of electric charge?

Charges can exist without mass.

What is the primary method of charging a conductor?

The force between two charges is inversely proportional to the square of the distance between them.

Which of the following is NOT a property of electric charges?

Similar charges repel each other.

The principle of superposition of forces states that:

The electric field due to a point charge is radially outward from the charge if the charge is positive.

Electric field lines can intersect each other.

The electric field inside a conductor is always zero.

Electric field lines are always continuous.

What is the electric field due to an infinitely long straight charged wire?

The electric field inside a hollow, uniformly charged spherical conductor is zero.

Electric flux is a scalar quantity.

Gauss's Law states that the net electric flux through any closed surface is proportional to the total charge enclosed within the surface.

Gauss's Law is only valid for symmetrical charge distributions.

The electric field at a point due to a combination of charges is the vector sum of the fields due to each individual charge.

What is the electric field inside a uniformly charged, non-conducting sphere?

The electric field outside a uniformly charged, non-conducting sphere is the same as if all the charge were concentrated at the center.

The electric field inside a hollow, uniformly charged, conducting sphere is always zero.

The electric field inside a solid, uniformly charged, non-conducting sphere is always zero.

The electric field inside a spherical cavity within a solid, uniformly charged, non-conducting sphere is always zero.

Electric potential is a scalar quantity.

The electric potential at a point due to a collection of point charges is the vector sum of the potentials due to each individual charge.

The electric potential energy of a system of charges is the work done in bringing the charges together from infinity.

The electric potential is zero at infinity.

The electric field at a point is equal to the negative gradient of the electric potential at that point.

The electric potential energy of two point charges is proportional to the inverse of the distance between them.

The electric potential energy of a system of charges is a scalar quantity.

The electric potential energy of a system of charges is always positive.

The electric potential energy of a system of charges is conserved.

The electric potential energy of a system of charges is equal to the work done in assembling the charges from infinity.

The electric potential energy of a system of charges is independent of the path taken to assemble the charges.

The electric potential energy of a system of charges is always equal to the sum of the potential energies of each pair of charges.

The electric potential energy of a system of charges can be calculated using the formula $U = rac{kQ_1Q_2}{r}$ where $Q_1$ and $Q_2$ are the charges and $r$ is the distance between them.

The electric potential energy of a system of charges is zero if the charges are at rest.

The electric potential energy of a system of charges is a measure of the work done in bringing the charges from infinity to their current positions.

The electric potential energy of a system of charges is always positive if the charges are all positive.

The electric potential energy of a system of charges is always negative if the charges are all negative.

The electric potential energy of a system of charges is always zero if the net charge of the system is zero.

The electric potential energy of a system of charges is always zero if the charges are all at rest.

The electric potential is a measure of the work done in moving a unit positive charge from infinity to a point in an electric field.

The electric potential at a point is always zero if the electric field at that point is zero.

The electric potential at a point is always positive if the electric field at that point is positive.

The electric potential at a point is always negative if the electric field at that point is negative.

The electric potential at a point is always zero if the electric field at that point is negative.

The electric potential at a point is always zero if the electric field at that point is constant.

The electric potential at a point is always constant if the electric field at that point is zero.

The electric potential at a point is always non-zero if the electric field at that point is non-zero.

The electric potential at a point is always positive if the electric field at that point is non-zero.