49 Replies
@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.cant we say f1= f2=f3=0 by electrostatic shielding
ye nahi padha hai bro
shielding nahi hua abhi?
nahh i think agli ki classes me yahi karwaenge
anyone...?
induced charges
i think
have you studied charge induction in conductors?
but they specifically said large distance
r and charge on conductor is 0 so now im not sure anymore
nvmyes i did
mere logic se toh zero aa rha sab
Just a sec, what are F1, F2, F3?
ill update the ques
,rotate
Aisa distribution hoga mere khayal se
Outermost surface jispe qb+qc charge hai uski charge density qd pe depend karegi
qd pe qb ek force lagayega and qc ek force lagayega
uska exact opposite force charge induced on sphere lagayega
hm shouldnt force on q1 and q2 be 0
and qd pe k(qb+qc)/r^2
yep
kaise
what even is q1
mb i meant jo dono charges hai sphere me
why tho
I'm guessing B?
Sorry about the delay
yeah B
So what's the doubt?
f3 kya hoga
its easy but if you really want an explanation
purcell has one
F3 will be coulomb force na?
i think i get it now
correct me if i am wrong
andar jo charge hai qb and qc unka force is exactly the opposite of the force of charges induced in the cavity. thus cavity mein induced charge and cavity ke andar ka charge has no effect in outerworld
however the charges induced on the bigger sphere will have a force on the external particle
damn.
Yup.
Wait, you hadn't got that? I thought you were moving forward with that fact and I was confused as to what else you wanted to know.
🤦♂️
Sorry mate
this concept made my brain melt today dude
I suggest reading Griffiths for this one concept. Even if just for this.
Griffiths made it really clear to me
And not with maths either
Through logic
can u share pdf
or photos
(its clear now but still )
the entire conductors part theoretical questions
https://nucleares.unam.mx/~martinel/griffiths_4ed.pdf
what can we say bout their magnitudes if the charges werent at centre
It'll remain the same
Irrespective of the positioning of the charge inside the cavity
Ooh
yeahh
Lemme read again thank you tho 😭
cuz charge density would would be diff
and they wont cancel each other out
Hmm so if it were off centre there would exist some field at the centre of the cavity
I don't understand this
I mean if it were off centre then it would be attracted to the boundary of the cavity
But what logic has he given
yep
when it is at centre, it induces -Qb on surface, distributed uniformly so negative charge elements on a diameter cancel each other out
I don't get this line:
"The charge therefore doesn't change the fact that electric field is zero at the centre"
i mean there would be more charge density on the part of the boundary its near to so more attraction
This line though :((
arre this just means ki before Qb was there, field was zero at centre...and afterwards too, when Qb is placed at centre field is still 0
I meann it makes sense cause F=qE so E is zero
Bohot confusing karke likhte hain :')
Thank you again for pointing it out warna I would stick to the wrong concepts
np np
+solved @Opt @coolguy.
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