• Support PF! Buy your school textbooks, materials and every day products Here!

Electric charges and fields: Crossed dipoles

  • Thread starter Ujjwal28
  • Start date
  • #1
32
0

Homework Statement


Two short dipoles each of dipole moment p are placed art origin. The dipole moment of one dipole is along x axis while that of other is along y axis. Then what will be the electric field at a point (a, 0)?


Homework Equations


The direction of electric field due to axial dipole has to be along +ve x axis while electric field due to equatorial dipole should be towards -ve x axis.


The Attempt at a Solution


So shouldn't the net electric field at (a, 0) be
E=2kp/a3-kp/a3
Well the answer is k50.5p/a3.can someone please explain where I am wrong?
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
7
Check the direction of the electric field due to a dipole along the equatorial direction.
 
  • #3
32
0
Ok isn't the direction of electric field at equatorial line anti parallel to that of direction of electric filed at axial line?
Where am I wrong?
 
  • #4
rl.bhat
Homework Helper
4,433
7
Ok isn't the direction of electric field at equatorial line anti parallel to that of direction of electric filed at axial line?
Where am I wrong?
Yes. Check it again.
 
  • #5
32
0
Ok so is it perpendicular to the direction of electric field on axial line?
 
  • #6
rl.bhat
Homework Helper
4,433
7
Yes. Along -y axis. Now calculate net electric field at ( a,0)
 
  • #7
32
0
Ok do I the electric field due to axial line is taken to be from left to right i.e along +ve x axis , will the electric field due to axial line be perpendicular towards +ve y axis? And then adding the two fields vectorially I get the answer?
 
  • #8
rl.bhat
Homework Helper
4,433
7
Ok do I the electric field due to axial line is taken to be from left to right i.e along +ve x axis , will the electric field due to axial line be perpendicular towards +ve y axis? And then adding the two fields vectorially I get the answer?
Check this statement
 
  • #9
32
0
Sorry can you explain?
 
  • #10
rl.bhat
Homework Helper
4,433
7
Sorry can you explain?
For the dipole along y-axis, the point ( a,0 ) lies on the equatorial line and the electric field is along - y axis.
 

Related Threads on Electric charges and fields: Crossed dipoles

Replies
3
Views
24K
Replies
3
Views
4K
  • Last Post
Replies
7
Views
1K
Replies
3
Views
3K
Replies
2
Views
7K
Replies
1
Views
1K
  • Last Post
Replies
2
Views
1K
Top