Cracking the SAT Physics Subject Test

charges reach out across empty space to each other to produce a force, we can instead interpret the interaction in the following ...

Since the force on the test charge q has a strength of kqQ/r^2 , when we divide this by q, we get the expression for the strengt ...

Electric field vectors can be added like any other vectors. If we had two source charges, their fields would overlap and effecti ...

Notice that, as with electric field vectors, electric field lines always point away from positive source charges and toward nega ...

Finally, notice that electric field lines never cross. A charge q = +3.0 nC is placed at a location at which the electric field ...

Therefore, in this case, Fon (^) q = qE = (3 × 10−9 C)(400 N/C) = 1.2 × 10−6 N. A dipole is formed by two point charges, each o ...

Using the equation for the electric field strength due to a single point charge, we find that If a charge q = −5.0 pC were plac ...

Fon (^) q = qE = (−5.0 × 10−12 C)(8.0 × 10^4 N/C to the right) = 4.0 × 10−7 N to the left. What can you say about the electric ...

CONDUCTORS AND INSULATORS Materials can be broadly classified based on their ability to permit the flow of charge. If electrons ...

Once these excess electrons establish a uniform distribution on the outer surface of the sphere, there will be no net electric f ...

with metal. Charges may move around on the outer surface of your cage, but within the cage, the electric field will be zero. Als ...

Now what if the sphere were made of glass (an insulator)? Although there aren’t free electrons that can move to the near side of ...

molecule toward positively charged ions or away from a negatively charged ion; in each case, the resulting force between the ion ...

Chapter 9 Comprehensive Drill See Chapter 17 for solutions. If the distance between two positive point charges is tripled, then ...

(B) (C) (D) (E) The figure above shows two point charges, +Q and −Q. If the negative charge were absent, the electric field at ...

(D) increasing velocity and decreasing acceleration. (E) increasing velocity and increasing acceleration. An object of charge + ...

direction from the electric field vector. (C) Electric field vectors point toward a negative source charge, and the resulting el ...

The figure above shows four point charges fixed in position at the corners of a square. What charge would have to be present at ...

Key Terms electromagnetic force electric charge charged ionization conserved elementary charge quantized coulombs electric force ...

Summary Electric charge is a quality of protons and electrons that gives them an attractive force. Protons are positive, while e ...