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1. [12 pts] The diagram at the right shows two charged conducting objects, A and B, with electric field lines drawn as shown. The electric potential of the surface of B is 200 V and is -50 Volts on the surface of A. Explain your answers to the following questions: a. What are the sign of the charges on A and B? Explain. b. Draw representative equipotential lines in the region surrounding A and B. Label representative values of the electric potential on these equipotential surfaces. Explain your drawing.

1. [12 pts] The diagram at the right shows two charged conducting objects, A and B, with electric field lines drawn as shown. The electric potential of the surface of B is 200 V and is -50 Volts on the surface of A. Explain your answers to the following questions: a. What are the sign of the charges on A and B? Explain. b. Draw representative equipotential lines in the region surrounding A and B. Label representative values of the electric potential on these equipotential surfaces. Explain your drawing.

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1.[12 pts] The diagram at the right shows two charged conducting objects, A and B , with electric field lines drawn as shown. The electric potential of the surface of B is 200 V and is -50 Volts on the surface of A. Explain your answers to the following questions: a. What are the sign of the charges on A and B? Explain. b. Draw representative equipotential lines in the region surrounding A and B. Label representative values of the electric potential on these equipotential surfaces. Explain your drawing.

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10a) (15 Points) In the following circuit, an NMOS transistor is used to switch the current to the LED. Assume the following parameters: Microcontroller: vO = 4.6 V iOH < −5 mA and vOL = 0.4 V, iOL < 8 mA LED: vf = 2.0 V, PLED−max = 200 mW Desired LED current 100 mA Transistor: vT = 1.0 V, RDS(ON) = 0.5 Ω, iD−max = 500 mA a. When the output of the microcontroller is low, what is the operating region of the transistor? b. When the output of the microcontroller is high, what is the operating region of the transistor? c. With the microcontroller output high, and the transistor in the ohmic region, what value of R results in an on-state LED current of 100 mA? d. What standard value of resistor (Table is on page 33 of the text) comes closest to the desired LED current? 10b) Suppose we rearrange the NMOS circuit in problem 10 as shown. Using the same parameters as in the previous problem, answer the following: a. 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