IIT JEE , AIEEE Forum - Physics , Electricity

ekbana_bombabu

1. A non cond.sheet of large surf. area and thick. d contains unif.charge distub.of density p . find E at a point inside the plate at a distance x from the central plane. Draw a qualitative graph of E against x for 0<x<d.

2. the plates of capactior are 2 cm apart.an electron - proton pair is released in gap betw.the plates,the prot.reaches the -ve plate at the same time as the ele.reaches the +veplate. at what distance from the -ve plate was pair released.

rat

for first question apply gauss law

take an arbitrary surface symmetrically about the central line with its edges at distance of x from centre

now (p*2x*A)/

= E*2x*l

for second question

electron....a=eE/m_e proton....a=eE/m_p

let the pair was released at a distance of x cm from negative plate

so s=1/2 at²

using it t² =x*(2m_p)/eE=(2-x)*(2m_e)/eE

now solve it to get x!

umang

Hey rat !

I tried the 2nd que the same way , but got the wrong answer !!!!

can u help ???

rat

thats the only way i can think of at present .... how much of adifference did you get in the answer...i mean the right and wrong ones!

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