Question

(10 points) a) Two through the box? charges Qi and Q2 are inside a closed cubical box of side a. What is the net outward flux iv. (Qi + Q)/(4a) b) As two positive charges are brought closer together i. the repulsive force between them will decrease in magnitude ii. the repulsive force between them will increase in magnitude ii. the attractive force between them wil decrease in magnitude iv. the attractive force between them will increase in magnitude v. trick question since the force does not depend upon the separation between the charges c) Gauss's law in integral form tells us that i. if the net charge within a spherical surface is zero, then the electric field is zero ii. if the electric flux through a spherical surface is zero, then there is no charge within the sphere iii. if the electric flux through a spherical surface is zcro, then the net charge within the sphere is zero iv. Coulomb's law is wrong v. we can know absolutely nothing about charge contained within a spherical surface d) Suppose that a uniform electric field exists in a certain region of space. Now consider a mathematical plane surface of area A. To maximize the flux through this surface, the face of the plane i. must be placed parallel to the field ii. must be placed perpendicular to the field ii. must be placed at 45 with the field iv. The flux cannot be maximized because it is always zero for a plane surface When compared to a capacitor with no dielectric, adding a dielectric i. always increases capacitance 11. sometimes increases capacitance e) 11. never increases capacitance

Answer 1

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