A negative point charge −q is at the center of a hollow insulating spherical shell, which has an inner radius r1 and an outer radius r2. There is a total charge of +4q spread uniformly throughout the volume of the insulating shell, not just on its surface. Determine the electric field for the following. (use any variable or symbol stated above along with the following as necessary: r and ε0. ).

An ecosystem is shown in the illustration. assume that human activities have led to a decrease in the number of eagles. a virus attack on rabbits has led to a decrease in their population in the ecosystem. which two sentences describe likely effects on the ecosystem? 1. there’s an increase in the number of snakes and insects and a decrease in the number of frogs. 2. there’s an increase in the number of snakes and insects, and the storks face increased competition for food. 3. there’s an increase in the number of storks and a decrease in the number of snakes and insects. 4. there’s an increase in the number of frogs and a decrease in the number of storks and insects. 5. there’s a decrease in the number of snakes, insects, and frogs.