Reading Quiz #1

1. Reading Quiz #1 • What is true about electric charges? • Unlike charges repel • Unlike charges attract • Like charges attract • Two of the above • Is electric charge conserved? • Yes b) No c) If no magnetic fields are present • Which is a true statement about Coulomb’s law? • Electrostatic force falls off like distance squared • The force between two charges is inversely proportional to the amount of charge • None of the above

2. Reading Quiz #2 • What characterizes the electric field? • It is the associated with a charge or a charge configuration • It depends on the charge of the test particle probing it • Its direction and strength both depend on the position of the probe charge • Two of the above • The electric field lines associated with a negative charge..? • Point radially outward from the charge • Point radially inward toward the charge • Point radially, but direction depends on sign of probe charge • Go anti-clockwise around the charge • … charge(s) at a distance constitute an electric dipole? • Two positive b) Two negative c) A positive and a negative

3. Reading Quiz #3 • The amount of electric flux depends on • Strength of the electric field • Angle between surface pierced by field lines and electric field • The area of the surface • All of the above • Two of the above 2) Gauss’s Law is a relation between … a) … area and electric flux b) …charge and electric flux c) …area and electrostatic force d) …electric potential and charge

4. Reading Quiz #4 1)Which of the following statements is NOT true? The electric potential … a. has units of Volts. b. is the electrical potential energy per unit charge. c. is a vector like the electric field. d. obeys the Principle of Superposition. 2)The product of a charge q with a potential difference Vab is equal to … a. the (minimum) work done in moving the charge from a to b. b. the change in the charge’s potential energy between a and b. c. Both of the above are true. d. Neither of the above is true.

5. Reading Quiz #5 • Equipotential lines … • … are lines of equal electric field • … are perpendicular to the electric field • Both of the above • None of the above • The electric field in one dimension… • … is the integral over the potential • … is the integral over the potential energy • … is the derivative of the potential • … is the derivative of the potential energy

6. Reading Quiz #6 • The charge stored in a capacitor is proportional to a) … its capacitance b) … its resistance c) … the voltage across the capacitor plates d) Two of the above e) All of the above 2)What is the equivalent capacitance of a series of capacitors? a) sum of the individual capacitances b) inverse of the sum of the inverse capacitances

7. Reading Quiz #7 • The amount of electric energy stored on a capacitor …? a) grows with voltage and charge b) grows with voltage, declines with charge c) declines with voltage and charge d) none of above 2)Material between the plates of a capacitor is a … a) Dialectic b) Dielectric c) Dialectric d) Bimetal 3)What is the effect of material between cap. plates? • Increases capacitance b) Decreases capacitance c) No effect on capacitance, but on charge on plates

8. Reading Quiz #8 • Electric current is …? • The rate change of electric potential per time • Amount of charge passing a point (in a wire) per time • Rate change of charge per unit area • Two of the above 2)Which term was NOT defined in the reading assignment? a.Resistivity. b. Current. c. Conductivity. d. Impedance. 3)Which is a form of Ohm’s law? • R=V/I • C=Q/V • V=I/R • Q=CU