Question

Problem 14: A 3-D printer lays down a semicircular are of positively charged plastic with a radius R = 2.9 cm, and a linear charge density of 2 = +1.1 C/m. After the printer has finished the are, the stylus moves to the center of the are as shown. The minute segment of the plastic arc highlighted in the diagram subtends an angle de. Note the measurement of the angle e shown in the figure.

 Part (a) Input a symbolic expression for the charge dq on the segment of charge of size dθ in terms of given parameters.

 Part (b) Input a symbolic expression for the electric force vector, exerted by the minute segment of plastic subtending the are dθ on an electron (charge -e), within the stylus at the center of the arc. Express your answer in terms of given parameters, fundamental constants, and the unit vectors i and j in the specified coordinate system.

 Part (c) Find the indefinite integral of the x-component Fx from part (b), but do not evaluate the limits.

 Part (d) Select the limits of integration that would result in the correct calculation of the force exerted by the entire line of plastic on an electron in the stylus as shown in the diagram.

 Part (e) Using the limits from part (d) and the expression from part (c) to determine an expression for the magnitude of the electrical force exerted by the positively charged line of plastic on the electron in the stylus.

Answer 1