1) Draw the electric field lines indicating its direction by arrows for a      (a) positive point charge      (b) negative point charge          (c)               electric dipole consisting of                                                                                                               a positive and negative charge                                                                                         2

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1) Draw the electric field lines indicating its direction by arrows for a

     (a) positive point charge

     (b) negative point charge    

     (c)               electric dipole consisting of                                                                                                               a positive and negative charge                                                                                     

 

 2. Calculate the magnitude of the E-field produced by a 10 mC point charge at a distance of 0.2 m  !

                                                            k = 9 x 10⁹ Nm²/C²                                          Show calculation:                                           

 E = _________ N/C

 3. Calculate the force acting on a charge of 20 mC placed in an electric field of  E = 500 V/m?

     Show calculation:       

   F = _________ N

  4. Two positive charges of 4mC each are located at a distance of 10 cm from each other.

      What is the magnitude of the force exerted on each charge?                             Show calculation:

( )   0.144 N                           

( )   1.44 N

( )   14.4 N

( )   144 N

( )   other

   5. A positive charge is fixed at the origin.  A negative charge 

     is moved along the x-axis from  x = 50 cm to x = 10 cm.                  +              -     ¬          -

     The potential energy of the negative charge                                  

     ( )  does not change          ( ) increases    ( ) decreases.              

   6. A uniform electric field between two parallel plates has a magnitude of 20 N/C and is directed downward. 

     Draw the E- field  indicating  with    + / - signs

     which plate is positive and which is negative?

7. A charge brought into this field experiences  a force of 10.0 N downward.

      The charge must be (indicate sign of charge with + or -)            Show calculation:

   ( )  +50 C                              

   ( )  -50 C

   ( )  +0.5 C

   ( )  -0.5 C      

8. If the potential at point A is one volt it means that

( )  an object at A has charge equal to one coulomb.

( )  an electron at A can perform one joule of work.

( )  here is a small battery present.

( )  a charge at A has a potential energy of one joule for each coulomb of charge.    

  

9. A capacitor consisting of two parallel plates separated by 4.0 cm has a potential of 100 V on the top 

        plate and a potential of 0 V on the bottom plate.  The value of the electric field in the middle is

( )  100 N/C                                                                                                        Show calculation:

( )  400 N/C

( )  2500 N/C

( )  5000 N/C