Ph102 Q01. ch15a. Electric Charge

 

   1     Two electrically neutral materials are rubbed together. One acquires a net positive charge.

         The other must have

 

              A   lost electrons.

              B    gained electrons.

              C   lost protons.

              D   gained protons.

 

   2     What is the charge on a body that has an excess of 20 electrons?

 

              A   -3.2 x 10-18C

              B    -1.6 x 10-18C

              C   3.2 x 10-19C

              D   2.4 x 10-19C

 

   3     Which electric charge is possible?

 

              A   6.02 x 10-23 C

              B    3.2 x 10-19 C

              C   2.4 x 10-19 C

              D   8.0 x 10-20 C

 

   4     In a solid metal conductor, electric current is the movement of

 

              A   electrons only.

              B    protons only.

              C   nuclei.

              D   electrons and protons.

 

 

 

 

 

ph102. q02. ch15b. ElectricField

 

   1     Which diagram best represents the electric field lines around two oppositely charged

         particles?

 


A

 

 

 

 

 

 

                   

B

                     

 

 

 

 

C

 

             

 

 

D  

 

   2     Which of the following is a vector quantity?

A    Electric charge      B   Electric energy        C   Electric power        D    Electric field

 

   3     Assume two point charges, A=2.0 x 10-4C and B = -4.0 x 10-4C, with A at coordinates x=0  m, y=0 m and B at 0 m, 6.0 m. What are the components (x,y) of the electrostatic force

         exerted on point A?

              A   (0, 20) N

              B    (0, -20) N

              C   (+20 , 0) N

              D   (-20,0) N

 

   4     Assume two point charges, A=2.0 x 10-4C and B = -4.0 x 10-4C, with A at coordinates x=0

         m, y=0 m and B at 0 m, 6.0 m. What are the components (x,y) of the electrostatic FIELD

         exerted on point A?

              A   (0,  1x10^5) N/C

              B    (0,  -1x10^5) N/C

              C   (+1x10^5 , 0) N/C

              D   ( -1x10^5,  0) N/C

ph102 q03. ch16a. Electric Potential

 

   1     Consider two charges, Q1=-9x10^(-6) C and Q2=-5x10^(-5)C, which are 0.4m apart.

         What is the electric potential at Q1?  There are no other charges besides Q1 and Q2.

 

              A   -1.12x10^6 J/C

              B    1.12x10^6 J/C

              C   -1.12x10^6 J

              D   1.12x10^5 J

 

   2     Consider the same charges, Q1=-9x10^(-6) C and Q2=-5x10^(-5)C, the same 0.4m apart.

         What total kinetic energy would the two have if Q1 and Q2 fell to 0.4m from an infinite

         distance apart?

 

              A   10.1 J, They fall together naturally

              B    -10.1 J, They would not fall.  Work has to be done to bring them together.

              C   101 J, They fall together naturally

              D   -101 J,  Work has to be done to bring them together.

 

   3     Which of the following is a vector quantity?

 

              A   Electric charge

              B    Electric energy

              C   Electric power

              D   Electric field

 

   4     What is the potential difference between point A and point B if 10 J of work is required to

         move a charge of 4.0 C from one point to the other?

 

              A   0.4 V

              B    2.5 V

              C   14 V

              D   40 V

 

 

ph102. q04. ch16b. Capacitance                                                                       

 

   1     For a capacitor, the ...............   the area of opposite plates are and the ............ the

         distance between them the more charge is stored on its plates.

 

              A   larger,  smaller

              B    smaller, larger

              C   smaller, smaller

              D   larger, larger

 

   2     Three identical plate capacitors are set up.  The first has empty space between the plates.

         The second, air.  The third, has rubber.  When identical voltages are applied,  which has

         the most charge stored on the plates?

 

              A   The first.

              B    The second.

              C   The third.

              D   The charges are all the same.

 

   3     A parallel plate capacitor has circular plates whose radii are each 0.2m.  Find the

         capacitance if these plates are separated by 0.003 m of rubber.

 

              A   1.0x10^(-12) F

              B    1.0x10^(-11)F

              C   1.0x10^(-10)F

              D   1.0x10^(-9)F

 

   4     A camera flash unit capacitor has C=75 micro farads.  If 200 volts is applied to it, then the   energy stored is  ....

 

              A   15 J

              B    1.5 J

              C   0.15 J

              D   75 micro J

 

 

 

 

 

p102. q05. ch17. Electric Current                                                                      

 

   1     For a circuit with constant resistance, which graph represents the relation between current and potential?

 

              A

 

              B

 

              C

 

              D

 

   2     The ratio of the potential difference across a conductor and the current moving through the  conductor is called the:

 

A    resistance.           B     conductance.    C  capacitance.          D   electric potential.

 

   3     The current through a conductor is 3.0 A when it is attached across a potential of 6.0 V.

         How much power is used?

 

A    0.50 W               B        2.0 W        C   9.0 W         D  18 W

 

 

   4     The current through a conductor is 3.0 A when it is attached across a potential of 6.0 V.

         What is the resistance of the circuit?

 

A      0.5 Ohms     B    18 Ohms     C  2 Ohms      D   6 Ohms

 

   5     What happens to the resistance, R,  of a wire if its cross-sectional area is doubled?

 

A     R is doubled.       B    R is halved.     C    R is quadrupled.     D    R is quartered.

 

                                                                                              p102.q06.ch18.DCCircuit(Serway) 

 

   1     What is the current in the circuit shown?

 

 

 


              A   0.5 A

              B    2.0 A

              C   6.0 A

              D   12 A

 

   2     A 12 Ohm load is connected across a 6.0 V dc source. How much energy does the load use in half  an hour?

 

A     1.5 x 10-3 kWh         B    2.0 x 10-3 kWh    C     3.0 x 10-3 kWh     D      12 x 10-3 kWh

 

   3     A current of 20.0 A flows through a battery with an emf of 6.20 V. If the internal resistance   of the battery is 0.01  , what is the terminal voltage?

 

A    1.24 V       B       6.00 V       C   6.40 V       D   31.0 V

 

   4     What must be the reading in the ammeter A for the circuit section shown?

          A  0 A       B   6.0 A       C     8.0 A        D    12  A

 

   5     If the potential of a dc source is 5.0 volts, and R2=10 , what must be the potential

         diffference across R2 in the circuit shown?   R1 and R2 are in parallel and connected to the DC source on the left side.