t t + 1- For the finite line charge in Fig. 1 write an expression for the electric field. < (0, 0, z) T B (0, 0, z') dl A dE, dE -dE (x, y, z) R Fig. 1 y 2- What is the relationship between electric field and potential? For a given potential < V= f(x,y,z) how do you determine the electric field. < < 3- What is an electric dipole? Write an expression for electric potential and electric flux density in the vacuum for a dipole at far-field. < < 4- Explain equipotential lines and plot equipotential lines for a point charge.