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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A positively charged sphere of radius r 0 ​ carries a volume charge density ρ. A spherical cavity of radius r 0 ​ /2 is then scooped out and left empty. C 1 ​ is the center of the sphere and C 2 ​ that of the cavity. What is the direction and magnitude of the electric field at a point B?

A positively charged sphere of radius r 0 ​ carries a volume charge density ρ. A spherical cavity of radius r 0 ​ /2 is then scooped out and left empty. C 1 ​ is the center of the sphere and C 2 ​ that of the cavity. What is the direction and magnitude of the electric field at a point B?

The number of electric field lines crossing an area ΔS is n1 when ΔS→∣∣E→ while the number of field lines crossing the same area is n2 when ΔE makes an angles of 30∘ with E. Then