1. A uniform electric field of magnitude E = 435 N/C makes an angle of = 85.0⁰ with a plane surface of area A = 3.50 m². Find the electric flux.

2. Find the change in electric potential energy associated with an electron fired from x = -0.0300 m and reaching x = 0.120 m.

3. The voltage across an air-filled parallel-plate capacitor is measured to be 90.0 V. When a dielectric is inserted and completely fills the space between the plates, the voltage drops to 35.0 V. What is the dielectric constant of the inserted material?

4. A 12.0-V battery is connected to a 4.5-uF capacitor. How much energy is stored in the capacitor?