IIT JEE , AIEEE Forum - Physics , Electricity

NAVIO

2 concentric spheres of radii R and r have similar charges with equal surface densities

.what is the electric potential at their common centre

anchal_1991

{(k

)/

R³} + {(k

)/

r ³}

joyfrancis

Potential due to sphere at the center.

=3KQ/2R [ r being the radius of the sphere]

.: for smaller one

V1=3KQ/2r

=3K(

4pir^2)/2r

=12K

pi*r

similarly potential due to bigger one

=12K

pi*R

So net potential = 12K

pi(R+r)

= [3(R+r)] / o

deepak_agarwal

joy francis is absolutely rit but let ,me add sumthing...surface charge density is charge per unit surface area..and surface charge density of the two spheres r same..and their radius is given and hence we can find charges on each of them..so potential is simply their sum of potentials

maverick83

Answer provided by Joy is wrong....
As spheres r conc. therefore they must be hollow and for hollow sphere pot is constant and same as on the surface
Now find the pot. by each sphere and add them...

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