4. An insulating sphere with a radius of 20 cm carries a uniform volume charge density of 1.5
μC/m3. Use Gauss’ law and find the magnitude of the electric field at (a) a point inside the sphere that lies 10 cm from the center. (b) a point outside the sphere that lies 30 cm from
the center.
5. A basket with 0.15 m radius mouth, 0.10 m radius base and 0.2 m height is in a uniform electric field of magnitude 300 N/C and perpendicular to the opening. Obtain the total flux through the sides of the basket.
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