IIT JEE , AIEEE Forum - Physics , Electricity

ananth_patri

A spherical portion of the sphere is removed form a solid sphere having a charge distributed uniformly in its volume. The electric field inside the emptied space is ??

A) zero everywhere

B) non zero and uniform

C)non uniform

D)zero only at the cente

I think its A no???but answer is given as B how

plz reply soon ...rates assurred

arpan1

constant and non-zero

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ananth_patri

edited plz see and reply...how it must be zero no? cause the field inside is zero in electro statics condition..

arpan1

see below for ans

ananth_patri

aree bhai expl to phele do....phir rate karunga.....

ananth_patri

help.....

arpan1

see here

i am giving u a clue

let A be the centre of the larger sphere and B be the centre of the cavity

then

electric field at A = electric field at B = electric field at any arbitrary point C in the cavity ....

hope u understood

in case not, nudge me
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ananth_patri

well but in electro statics cond the field inside the cavity must be zero else there will be pot diff and curret flows which contradicts electrostatics..soplz expl....where i am wrong??

arpan1

that is in case of a conductor

here it is nowhere mentioned that it is a conductor

for clarity, the solid sphere can be anything like a ball etc...

hope u understood

confirm and pls rate ...

rakesh61

let me help its true that a cavity inside a conductor has 0 E inside it but this is true when the cavity has all its surface at constant and same distance from the conductor in this case cavity is not in middle so the Electric force acting on each pont in cavity are diffrent as a result there will be net electric field inside cavity

hope i cld help u any doubt tell me

arpan1

@ rakesh

the only reason is that the given sphere is not a conductor

hope u get it right

secondly, in a conductor , the position of cavity hardly matters and it is zero always ....

any arguments are welcome

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rakesh61

hey u cant take a qns like this its physics i

t is given that sphere is given charge on its surface an insulator can never have charge on its surface

in a conductor , the position of cavity matters and it is zero only when cavity at middle i am sure of my ans

and its iit qns do u think u think they will ask a w\qns having explanation as u have given

rakesh61

@ ananth is detailed ans given in that qns

arpan1

@ rakesh

who the hell told u that charges cannot reside on the surface of an insulator ..

pls get ur concepts right first

and btw , can u even logically or mathemetically prove me wrong

see the very case of asuming it conductong is wrong and that is what iit ppl wanted to test ....

they have nowhere mentioned that it is a conductor, o.k.

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