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A small object of mass 4.04 g and charge  −18.6 μC  is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. What are the magnitude and direction of the electric field? magnitude  N/C direction  ---Select--- upward East downward West

Problem #1 Chapter 2 Au is face-centered cubic metal with lattice constant 4.08 Å. If the atomic mass of Au is approximately 197 calculate the number of conduction electrons per unit volume (electrons/cm³) and number of electrons per unit mass (electrons/g). Assume that each Au atom donates one conduction electron.

Calculate the self inductance for the following cases. a)- A 3.5 m long coaxial cable with an inner radius of 0.8 mm and an outer radius of 4 mm (filled with a material of μr = 50 between conductors). b)-Fiberglass 500 turns toroid with inner radius 2cm, 2.5x2.5 cm2 cross section area square. c)-A 500 turns cylindrical solenoid with 2 cm inner radius. Between             0 <r <0.5  μr = 50, between 0.5 <r <2 μr = 1 was filled with material. The length of the solenoid is 50 cm.

6- Why an insulator is represented as a capacitor C? What are the assumption modes?

Please give me the correct answer. Everyones gets failed to do this

The Subject is Electromagnetic II .