1. A negatively charged pith ball (mass 7.00x10^-3 g , charge -2.20 nC ) is suspended vertically from a light nonconducting string of length 13.0 cm . This apparatus is then placed in a horizontal uniform electric field. After being released, the pith ball comes to a stable position at an angle of 11.2^o to the left of the vertical.

Part A. What is the direction of the external electric field?

Part B. Determine the magnitude of the electric field. Answer in N/C

Quesiton 2. Two parallel plates, 6.45 cm on a side, are separated by 5.32 mm

Part A. Determine their capacitance if the volume from one plate to midplane is filled with a material of dielectric constant 2.55 and the rest is filled with a different material of dielectric constant 4.10.

Part B. If these plates are connected to a 12-V battery, what is the electric field strength in the dielectric region with k1 = 2.55 ?

Part C. What is the electric field strength in the dielectric region with k2 = 4.10 ?

Question 3 Two parallel plates, 6.25 cm on a side, are separated by 7.12 mm

part A. Determine their capacitance if the volume from one edge to the middle is filled with a material of dielectric constant 2.55 and the rest is filled with a different material of dielectric constant 4.10.

Part B. If these plates are connected to a 12-V battery, what is the electric field strength in the dielectric region with k1 = 2.55?

Part C. What is the electric field strength in the dielectric region with k2 = 4.10?