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4/30/13 chapter 15 for credit www.webassign.net/web/Student/Assignment-Responses/last?dep=5127217 1/9 Current Score : 24 / 28 Due : Tuesday, January 15 2013 11:59 PM EST 1. 1/1 points | Previous Answers SerCP9 15.P.002. A charged particle A exerts a force of 2.75 μN to the right on charged particle B when the particles are 14.0 mm apart. Particle B moves straight away from A to make the distance between them 16.9 mm. What vector force does particle B then exert on A? 1.887 1.89 μN to the left chapter 15 for credit (Homework) WebAssign The due date for this assignment is past. Your work can be viewed below, but no changes can be made. Important! Before you view the answer key, decide whether or not you plan to request an extension. Your Instructor may not grant you an extension if you have viewed the answer key. Automatic extensions are not granted if you have viewed the answer key. Request Extension

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Physics II Chapter 15 Web Assign HW

Transcript of Preview of “chapter 15 for credit” copy

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Current  Score  :  24  /  28 Due  :  Tuesday,  January  15  2013  11:59  PM  EST

1. 1/1  points  |    Previous  Answers SerCP9  15.P.002.

A  charged  particle  A  exerts  a  force  of  2.75  μN  to  the  right  on  charged  particle  B  when  the  particlesare  14.0  mm  apart.  Particle  B  moves  straight  away  from  A  to  make  the  distance  between  them16.9  mm.  What  vector  force  does  particle  B  then  exert  on  A?1.887       1.89   μN  to  the  left

   

chapter  15  for  credit  (Homework)

Dyamond  SantiagoCollege  Physics  II  Dr.  Boucher  Spring  2013,  Spring  2013Instructor:  Derrick  Boucher

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Important!  Before  you  view  the  answer  key,  decide  whether  or  not  you  plan  to  request  an  extension.  YourInstructor  may  not  grant  you  an  extension  if  you  have  viewed  the  answer  key.  Automatic  extensions  are  not  grantedif  you  have  viewed  the  answer  key.

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2. 0/2  points  |    Previous  Answers SerCP9  15.P.004.

A  small  sphere  of  mass  m  =  6.50  g  and  charge  q1  =  27.0  nC  is  attached  to  the  end  of  a  string  and

hangs  vertically  as  in  the  figure.  A  second  charge  of  equal  mass  and  charge  q2  =  −58.0  nC  is

located  below  the  first  charge  a  distance  d  =  2.00  cm  below  the  first  charge  as  in  the  figure.

(a)  Find  the  tension  in  the  string.0.00352       0.0989  Your  response  differs  significantly  from  the  correct  answer.  Rework  your  solution  from  thebeginning  and  check  each  step  carefully.  N

(b)  If  the  string  can  withstand  a  maximum  tension  of  0.180  N,  what  is  the  smallest  valued  can  have  before  the  string  breaks?(No  Response)     1.1   cm

   

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3. 3/3  points  |    Previous  Answers SerCP9  15.P.018.

(a)  Determine  the  electric  field  strength  at  a  point  1.00  cm  to  the  left  of  the  middle  charge  shown

in  the  figure  below.

20000000       2.00e+07   N/C

(b)  If  a  charge  of  −3.80  μC  is  placed  at  this  point,  what  are  the  magnitude  and  direction  of  theforce  on  it?

magnitude         76       76   N

direction         toward  the  left       toward  the  left

   

4. 4/4  points  |    Previous  Answers SerCP9  15.P.023.MI.FB.

A  proton  accelerates  from  rest  in  a  uniform  electric  field  of  634  N/C.  At  some  later  time,  its  speed

is  1.14    106  m/s.

(a)  Find  the  magnitude  of  the  acceleration  of  the  proton.

60633592349       6.07e+10   m/s2

(b)  How  long  does  it  take  the  proton  to  reach  this  speed?

18.8       18.8   µs

(c)  How  far  has  it  moved  in  that  interval?

10.72       10.7   m

(d)  What  is  its  kinetic  energy  at  the  later  time?

1.085E-­15       1.09e-­15   J

     

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5. 3/4  points  |    Previous  Answers sercp9  15.p.024.nva

(a)  Three  point  charges,  A  =  2.2  µC,  B  =  7.5  µC,  and  C  =  -­3.9  µC,  are  located  at  the  corners  of  anequilateral  triangle  as  in  the  figure  above.  Find  the  magnitude  and  direction  of  the  electric  field  at

the  position  of  the  2.2  µC  charge.  

magnitude 230000       2.34e+05   N/C

direction

89       271  Your  response  differs  from  the  correct  answer  by  more  than  10%.  Double  check  your

calculations.°  (counterclockwise  from  the  +x-­axis)

(b)  How  would  the  electric  field  at  that  point  be  affected  if  the  charge  there  were  doubled?  

(c)  Would  the  magnitude  of  the  electric  force  be  affected?

 

6. 8/8  points  |    Previous  Answers SerCP9  15.P.035.

Refer  to  the  figure  below.  The  charge  lowered  into  the  center  of  the  hollow  conductor  has  a

magnitude  of  2  µC.  Find  the  magnitude  and  sign  of  the  charge  on  the  inside  and  outside  of  the

hollow  conductor  when  the  charge  is  as  shown  in  the  following  images:

The  magnitude  of  the  field  would  be  halved.

 The  field  would  be  unchanged.        

The  magnitude  of  the  field  would  double.

The  magnitude  of  the  field  would  quadruple.

no

 yes        

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(a)  Figure  (a)

Inside: 0       0   µC

Outside: 0       0   µC

(b)  Figure  (b)

Inside: 2       2   µC

Outside: -­2       -­2   µC

(c)  Figure  (c)

Inside: 0       0   µC

Outside: -­2       -­2   µC

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(d)  Figure  (d)

Inside: 0       0   µC

Outside: -­2       -­2   µC

   

7. 2/2  points  |    Previous  Answers SerCP9  15.P.044.

A  charge  q  =  +7.20  µC  is  located  at  the  center  of  a  regular  tetrahedron  (a  four-­sided  surface)  asin  figure  below.

(a)  Find  the  total  electric  flux  through  the  tetrahedron.

813174.53       8.14e+05   N  ·  m2/C

(b)  Find  the  electric  flux  through  one  face  of  the  tetrahedron.

203293.6       2.03e+05   N  ·  m2/C

   

8. 2/2  points  |    Previous  Answers SerCP9  15.P.045.soln.

A  point  charge  q  is  located  at  the  center  of  a  spherical  shell  of  radius  a  that  has  a  charge  -­quniformly  distributed  on  its  surface.  

Find  the  electric  field  for  the  following  points:

(a)  for  all  points  outside  the  spherical  shell

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(b)  for  a  point  inside  the  shell  a  distance  r  from  the  center

Solution  or  ExplanationNote  the  values  in  this  solution  reflect  those  of  the  text  book  question,  not  the  values  you  mayhave  received  for  this  question  above.

   

none  of  these

 E  =  0        

E  =  q/4πr2

E  =  kq/r2

E  =  kq2/r2

 E  =  kq/r2

E  =  kq2/r2        

E  =  0

E  =  q/4πr2

none  of  these

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9. 1/1  points  |    Previous  Answers SerCP9  15.P.052.MI.FB.

A  small  plastic  ball  of  mass  m  =  1.50  g  is  suspended  by  a  string  of  length  L  =  21.0  cm  in  auniform  electric  field,  as  shown  in  the  figure  below.  If  the  ball  is  in  equilibrium  when  the  stringmakes  a  θ  =  14.5°  angle  with  the  vertical  as  indicated,  what  is  the  net  charge  on  the  ball?3.8       3.8   µC

     

10.0/1  points  |    Previous  Answers SerCP9  15.P.062.

Three  identical  point  charges,  each  of  mass  m  =  0.350  kg,  hang  from  three  strings,  as  shown  inthe  figure  below.  If  the  lengths  of  the  left  and  right  strings  are  each  L  =  30.0  cm,  and  if  the  angleθ  is  45.0°,  determine  the  value  of  q.q  =   8.9914333329035107       3.71e-­06  Your  response  differs  significantly  from  the  correct  answer.  Rework  your  solution  from  thebeginning  and  check  each  step  carefully.  C

   

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