[" There are three concentric thin "],[" spheres of radius a,b and "],[c(a>b>c)." The total surface "],[" charge densities on their "],[" surfaces are "sigma,-c" and "sigma],[" respectively.The magnitude of "],[" electric field at 'r' (distance "],[" from centre) such that a ">r>b],[" is."]

There are three concentric thin spheres of radius a,b,c (agtbgtc) . The total surface charge densities on their surfaces are sigma,-sigma,sigma respectively. The magnitude of the electric field at r (distance from centre) such that agtrgtb is:

There are three concentric thin spheres of radius a,b,c (agtbgtc) . The total surface charge densities on their surfaces are sigma,-sigma,sigma respectively. The magnitude of the electric field at r (distance from centre) such that agtrgtb is:

There are three concentric thin spheres of radius a,b,c (agtbgtc) . The total surface charge densities on their surfaces are sigma,-sigma,sigma respectively. The magnitude of the electric field at r (distance from centre) such that agtrgtb is: A. 0 B. (sigma)/(epsilon_(0) r^(2))(b^(2)-c^(2)) C. (sigma)/(epsilon_(0)r)(a^(2)+b^(2)) D. none of these

Three concentric spherical metallic spheres A,B and C of radii a , b and c(a lt b lt c) have surface charge densities sigma , -sigma and sigma respectively.

Three concentric spherical metallic spheres A,B and C of radii a , b and c(a lt b lt c) have surface charge densities sigma , -sigma and sigma respectively.

Three concentric metallic spherical shells A,B and C of radii a,b and c(a lt blt c) have surface charge densities +sigma ,-sigma and +sigma respectively ,the potential of shell B is

Three concentric metallic spherical shells A,B and C of radii a,b and c(a lt blt c) have surface charge densities -sigma ,+sigma and -sigma respectively ,the potential of shell A is

Three concentric metal shells A, B, and C of respective radii a,b and c (a lt b lt c) have surface charge densities +sigma, -sigma and +sigma respectively. The potential of shell B is

Three concentric metallic spherical shell A,B and C or radii a,b and c (a lt b lt c) have surface charge densities -sigma, + sigma and -sigma . Respectively. The potential of shel A is :