Exam 3 - Physics 2

If a neutron is moving from a region of higher potential to a region of lower potential, what is its change in speed?

The speed stays the same

If there are two parallel lines of charge q that are of opposite signs and are close together, what are the potential and electric field at the midpoint between the two lines?

V=0, E≠0

When an electron is placed in a constant electric field, what are the change in potential and potential energy of the electron?

Positive change in potential and a negative change in potential energy.

When a proton is placed in a constant electric field, what are the change in potential and potential energy of the proton?

Negative change in potential and a negative change in potential energy.

If an electron is moving from a region of higher potential to a region of lower potential, what is its change in speed?

The speed decreases

Electric potential is:

A scalar.

What is meant when it is said that a charge is moving from a higher potential to a lower potential?

The charge is moving from a region with more positive charge to a region with more negative charge.

If there are two parallel lines of charge q that have the same sign and are close together, what are the potential and electric field at the midpoint between the two lines?

V≠0, E=0

If a proton is moving from a region of higher potential to a region of lower potential, what is its change in speed?

The speed increases.

Using Ohm's Law, keeping the resistance constant and increasing the applied voltage

increases the current.

Magnetic fields are:

Vectors.

Metals are generally good conductors because

charge carriers are able to move without restriction.

If three charges of equal magnitude are in a line with one another where charge one, which is positive, is separated from charge two, a negative charge, by the same distance that charge two is separated from charge three, which is a positive charge. What is the net force on the second charge?

ZERO

How do two similarly signed charges interact?

They repel one another.

How do two differently signed charges interact?

They attract one another.

For an infinite sheet of positive charge, the electric field lines:

are perpendicular to the sheet of charge and point away from the sheet.

For a positive point charge, the electric field vectors

point radially away from the charge.

What is alike when the term "two like charges" is used?

The particles have the same charge.

For an infinite sheet of negative charge, the electric field lines:

are perpendicular to the sheet of charge and point toward the sheet.

A plastic rod, initially uncharged, is rubbed with wool that is also uncharged and obtains a charge of -10 C. What is the charge on the wool after rubbing?

10 C

How do electric potential energies add together?

The values add together to produce a net amount without direction.

When is the electric field inside a conductor that is in electrostatic equilibrium zero?

Always.

Two charges, one 1 nC and the other -1 nC, are separated by a distance of 4 meters. What is the potential at the midpoint between the charges? The direction toward the -1 nC charge is positive.

0 V

How do electric forces add together?

The components add together to produce a net amount with direction.

For a positive point charge, the electric field vectors

point radially away from the charge.

Two charges, one 1 nC and the other -1 nC, are separated by a distance of 4 meters. What is the electric field at the midpoint between the charges? The direction toward the -1 nC charge is positive.

4.495 V/m

For a negative point charge, the electric field vectors

point radially toward the charge.

If 10 Joules of energy are required to move 5 Coulombs of charge between two points, what is the potential difference between the two points?

2 V

How do electric potentials add together?

The values add together to produce a net amount without direction.

How do electric fields add together?

The components add together to produce a net amount with direction.