There are three concentric thin spheres of radius a

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There are three concentric thin spheres of radius a, b, c ( a> b> c ). The total surface charge densities on their surfaces are σ,−σ,σ respectively. The magnitude of the electric field at r (distance from centre) such that a> r> b is:
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Sep
There are three concentric thin spheres of radius a, b, c ( a> b> c ). The total surface charge densities on their surfaces are σ,−σ,σ respectively. The magnitude of the electric field at r (distance from centre) such that a> r> b is: −σ B c ( a> b> c ). The total surface [...]
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Tags: −σ , B , c ( a> b> c ). The total surface charge densities on their surfaces are σ , There are three concentric thin spheres of radius a , σ respectively. The magnitude of the electric field at r (distance from centre) such that a> r> b is: ,