ppl... jus starting electrostatics so plz help..

Q1. HCV example 18.... given: dipole moment = 3.4*10-30C-m... separation = 10-10m .. find mag. of charge..

simple q = D/d = 3.4*10-20C

doubt is how can q have charge less than proton ?

Q2. A positive charge q is placed in front of a conducting solid cube at a dist. d fro, its centre. Find the electric field at the centre of the cube due to the charges appearing on its surface...

13 Answers

11
Subash ·

Read at your own risk [3]

for Q1 i think u have missed a 2

it is 2qd=D though that doesnt make much difference to your doubt[2]going nuts due to boards :(

sorry dint see the book

106
Asish Mahapatra ·

im posting the full answer given in HCV..

If the charges on the two atoms are q and -q,
then q(1.0*10-10m) = 3.4*10-30C-m
or, q = 3.4*10-20 C
Note that this is less then the charge of a proton. Can you explain, how such a charge can appear on an atom

the one in bold is the exact answer given in HCV...

106
Asish Mahapatra ·

i dont know... in HCV it is written that:

A combination of two charges +q and -q separated by a small distance d constitutes an electric dipole. the electric dipole moment of this combination is defined as a vector

p = qd

11
Subash ·

very sorry i dunno what lead me to talk like that :(

sorry if it confused you too :(

11
Subash ·

another wild one

it may be due to hydrogen bonding

106
Asish Mahapatra ·

question edited it is HCl molecule ... toh H-bonding kahaan se aaya?? lagta hai Verma sir bhi bahut kuch chemistry padhte honge..[3]

1
skygirl ·

wats the ans fro the second one ?

106
Asish Mahapatra ·

q/4πε0d2 towards the charge q

11
Mani Pal Singh ·

IN QUES 2
HINT
APPLY GAUSS LAW BY IMAGING NEW SURFACES AND BANK ON SYMMETRY

106
Asish Mahapatra ·

sumone plz help me ....

9
Celestine preetham ·

q1 see every molecule in dipole isnt fully polarised

33
Abhishek Priyam ·

For second it is q/4πε0d2 towards q

since cube is conducting so net field inside cube is zero...
so if field due to q is q/4πε0d2 away from q.. so net field due to cube should be q/4πε0d2
towards q to make it zero..

106
Asish Mahapatra ·

thx priyam and cele.. emperor 2

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