Cracking the SAT Physics Subject Test

The effect of this is to form a layer of negative charge along the top surface of the dielectric and a layer of positive charge ...

So the overall electric field has been reduced from its previous value: Etotal = E + Ei, and Etotal= E − Ei. Let’s say that the ...

Chapter 10 Comprehensive Drill See Chapter 17 for solutions. True statements about the relationship between the electric field ...

(A) 0 (B) (C) (D) (E) Which expresses the value of the electric field at the center of the square? Which expresses the value of ...

Negative charges are accelerated by electric fields toward points (A) at lower electric potential (B) at higher electric poten ...

The potential at point A n an electric field is 10 V higher than at point B. If a negative charge, q = −2 C, is moved from poin ...

How much work would the electric field (created by the stationary charge Q) perform as a charge q s moved from point B to A alo ...

Key Terms electrical potential energy electric potential volt equipotential surfaces capacitance parallel-plate capacitors farad ...

Summary The change in the electrical potential energy of a charge is defined by ∆UE = −WE. Essentially this is the same equation ...

Chapter 11 Direct Current Circuits In Chapter 9, we learned that an electrostatic field cannot be sustained within a conductor: ...

ELECTRIC CURRENT Picture a piece of metal wire. Within the metal, electrons are zooming around at speeds of about a million m/s ...

between a river’s current and an electric current: One moves water at a certain rate, and the other moves electric charge at a c ...

RESISTANCE Let’s say we had a copper wire and a glass fiber that had the same length and cross-sectional area, and that we hooke ...

If a voltage of 9 V is applied between the ends of the wire whose resistance is 0.2 Ω, what will be the resulting current? Her ...

VOLTAGE Now that we know how to measure current, the next question is, What causes it? Why does an electron drift through the ci ...

ELECTRIC CIRCUITS An electric current is maintained when the terminals of a voltage source (a battery, for example) are connecte ...

source must do positive work on the charge, forcing it to move from the negative terminal toward the positive terminal. The char ...

CIRCUIT ANALYSIS We will now develop a way of specifying the current, voltage, and power associated with each element in a circu ...

The emf (ε) of the battery is indicated, as is the resistance (R) of the resistor. It’s easy to determine the current in this ca ...

COMBINATIONS OF RESISTORS As you remember from Chapter 10, two common ways of combining circuit elements within a circuit is to ...