IIT JEE , AIEEE Forum - Physics , Electricity

Akshay

Can you please tell me the list of formulas for electrostatics regarding hollow and solid sphere and shell,i cant understand the concept of electric field and potential in the sphere or shell.Please help me

him26.89

hollow sphere:-

E =

0 for d < R

kq/r² for d>= r

V = CONSTANT = KQ/R for d<r

=kq/r for d>r

him26.89

solid sphere :

inside

E =

x/3

(

--> vol. charge density)

outside is same as that of hollow

pot.

outside is same of hollow

&inside is

kq(3r² - x²)/2r³

x is distance from centre.

akumar_ak

a) electric flux = q/epsilon naught

b)if a dipole is enclosed by a cosed surfacxe,flux =0
hence the algbraic sum of charges (+q-q) = 0

c)flux will come out of +ve charge is enlcosed,vice versa

d)flux from a cube :

i)if q is at the centre of cube,total flux = q/ep

ii)from each surface of cube,flux = q/6ep

e)electric field due to a charged shell = Q/4pieepr^2
here,the shell behaves like a pint charges

at a point on surface of shell : this is Emax.
E = Q/4pie*ep*r^2

at an inside point,E=0

akumar_ak

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