IIT JEE , AIEEE Forum - Physics , Electricity - 486 veiws no answer-electrostats reason assertion

vish0001

electric field at an inside will NOT be 0 ...use gauss law
it will come as a non zero answer

vish0001

but the reply is correct so answer is (d)

vish0001

for the second one

currenlt only flowes when ther is a potential difference
same charge does not mean necessarliy same potenital

so assertion is wrong
but reply is correct

so (d) again for this

ankur.kkhurana

it will be zero because -q charge will be induced which will make toal charge zero..

ankur.kkhurana

and to counter everybody point.I hav i one point that metallic shell doesnot allow passage of electric feild

ankur.kkhurana

and when electric feild passes, electrons will move towards it .It will cause heat dissipation,and there must be a point where movement of electrons stop.Otherwise it will become endless source of energy.

nik_d_1

for d first ques..no.. even if -q is inducd 2 d surface d field won`t b zero everywhere...... at on point yes ie one supposed shell surface... inside d given shell..... coz of d field due 2 inner charge q n d charge on d surface - q....so d statement which includes ne general point is wrong...bt d statement in reason is rite.....

nik_d_1

n for d second one 2 d ans is d coz.. even if dey have same charge if one is larger/smaller dan d other.. d potential at d surface wud b different...hence electric current will flow due 2 potential difference.....in both d questions..dere comes one such case where.. d statement is true..bt it cant b generalized hence..it will b false only....

so D for both..

neeraj_agarwal_1990

common man...
HOW CAN THERE BE FIELD INSIDE A CONDUCTOR!!!!

umang

Hey ankur !

Pls check if the charge q is placed at the centre of the sphere or not .

Here's the solution -

Que. 1 : Acc. to me , the charge q should be placed at the centre of the sphere .Then , redistribution of charges will take place . Charge on inner surface of sphere is -q and on outer surface is +q . Now , if u apply gauss law to find E at a point P , the charge enclosed will be q . so , there will be electric field . So , assertion is wrong !!!

Que. 2 : I agree with magiklo's solution .

ankur.kkhurana

what abt my reason .plz answer that

ankur.kkhurana

but total charge become 0 as.

q (at centre) + -q (induced)=0

electric feild is 0

ankur.kkhurana

and to counter everybody point.I hav i one point that metallic shell doesnot allow passage of electric feild and when electric feild passes, electrons will move towards it .It will cause heat dissipation,and there must be a point where movement of electrons stop.Otherwise it will become endless source of energy.

neeraj_agarwal_1990

umang ..it doesnt matter whether q is placed at centre or not...
-q will be induced at innere surface and q at the outer surface...
and electric field is always 0 inside the conductor...

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