34 Replies
can some1 tell me how to get the answer with and without using dipole
@Gyro Gearloose
Note for OP
+solved @user1 @user2... to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.i tried without dipole and using my imagination i was able to figure out net field should be 4*field due to one charge * sinalpha
(alpha mentioned in fig)
take out the feild from each charge and get a vector sum
it should give the ans
i got pretty much the same ans but was missing 1/root2
it indeed will but that vector sum itself is bothersome
nah it wont be
dipole here will make things more complicated
$$\frac{pK}{\sqrt{2}x^3}\left(\hat{z}-\hat{y}+\hat{z}+\hat{y}\right)$$
Opt
That's what I got.
Try simplifying, i might have made a mistake
yep this is correct
how did u get this
It's along equatorial plane of both dipoles na?
i couldnt visualise using dipole
$$-\frac{\vec{p}K}{r^3}$$
Opt
Diagonals are also dipoles
Use those
yeah i got that part
there will be two components of field due to dipole
Yeah, the two fields are along z-y, and z+y (divided by √2 to make them unit vectors)
The p vectors are opposite to those vectors I just wrote.
I flipped them in my head and typed it.
how did u fig out the dirn part
+q to -q
For field that is. Dipole moment is always - to +
the dipole in red gives z-y or z+y
z-y
i am thinking x+z
x-z
wait a min angle between p vector and r vector is 90 so radial component cancels only the other one remains
Look at the axes
They've given the axes already
@hardcoreisdead got it?
no not really
dipoles would have effects in their axes, not in one perpendicular to them.
Any reason you have taken the axis to be x?
https://www.khanacademy.org/science/electromagnetism/x4352f0cb3cc997f5:how-a-microwave-oven-works/x4352f0cb3cc997f5:what-are-electric-dipoles-and-how-do-they-behave-in-electric-fields/v/electric-dipoles-dipole-moments
They have effects along axis perpendicular to them as well
wont that get cancelled out here?
Oh you mean the field along perpendicular
Those don't exist
Mb mb
Yeah field is always parallel/antiparallel to dipole moment
haan matlab they are planar, is what i recall
for the marked dipole i am imagining a plane similar to xy plane but tilted 45 degs from y axis inwards
now angle between p vector and r vector ( from centere of dipole i.e origin to point M) is 0
so field along r vector becomes zero
field perpendicualr to r vector is kp/r^3
right ?