4. Given these equipotential lines, (a) A) 0.1 V/m↑ B) 0.9 V/m↑ C) 10 V/m ↑ D) 0.1 V/m E) 0.9 V/m F) 10 V/m What is the average electric field between these lines? (b) If you moved a -4.7 μC charge from the top line to the bottom line, what is the change in the charge's potential. energy PE? A) -14.1 μJ B) -3 μJ C) -0.6μJ D) 0.6J E) 3μJ F) 14.1 μJ 0.3m -4.7μC 5V 2V

0.2m Two parallel plates of area Im are separated by 0.2 m and connected to a 12 V battery as shown below. The plates are large enough compared to their separation that they may be area = 1 m2 considered as infinite. 49. Find the electric field between the plates. 12 Volts A) 20 V/m B) 30 V/m C) 40 V/m D) 50 V/m E) 60 V/m O B OD

Electric field lines and equipotential lines are always a) parallel, b) perpendicular, or c) at an angle that depends on the strength of the field.

8. How much work must be done to move charge Q2 = 2.0 x 10-6 C from A to B? The other charged object has a charge O = 8.0 x 106 C. -5.0 m- -2.0 m- A Q1 = 8.0 x 10-6 C Q2 = 2.0 x 10-6 C %3D (ans: 8.2 x 103 J) Page 3 of 17 2020-12-11

A parallel-plate capacitor filled with air has plates of area 6.5×10−3 m2 and a separation of 0.32 mm.  a) Find the magnitude of the charge on each plate when the capacitor is connected to a 11-V battery. (Q = ? nC) b) Why does answer A decrease if the seperation between the plates increases? c) Calculate the magnitude of the charge on the plates if the separation is 0.90 mm. (Q = ? nC)