Name _______________________________ Period _________________ Date _____________ Electric Field Practice 1. Calculate the electric field at 2.0m, 0.2 m, and 0.004 m from a +2 C charge. 2. Calculate the electric field in air at a distance of 30 cm from a point charge of q= +5.0 x 10-9 C. 3. Draw a diagram of the field lines for a positive point charge. 4. Calculate the electric field 0.5 m from a point charge with a magnitude of +10.0 C. 5. Determine the electric force acting on an electron placed in a uniform north to south electric field of 8.0 x 104 N/C. 6. A pith ball with a charge of +0.6C is placed into a region where there is a uniform electric field with a magnitude of 50 N/C. Determine the size of the electric force acting on the pith ball. 7. A Styrofoam coffee cup gains a net electric charge when it is removed from the bag. When the coffee cup is placed in a region where the electric field has a magnitude of 430 N/C and is directed from East to West, the coffee cup experiences a force of 43.6N West. Determine the magnitude and sign of the electric charge on the coffee cup. 8. A small object of mass 3.80 g and charge -18C “floats” in a uniform electric field. What is the magnitude and direction of the electric field? (Hint: Draw a FBD and think of the gravitational force here on Earth.) 9. A +2C charge sits at 0.0m and is collinear with a +6C charge at 0.75m. Determine the net electric field at the mid-point between the charges. 10. A -6C charge is 0.56m to the left of a -7C. Find the net electric field 0.5m to the right of the -7C charge. 11. q1 q2 A Charges q1 and q2 are at points of 0m and 3m on the x-axis, respectively. If q1= +5C and q2 = -6C, determine the net electric field at Point A if Point A is at 5m on the x-axis.