Question 9: \"Which of the following operations, if any, would increase the oscillation frequency of an LC circuit? I. Increasing the capacitance. II. Increasing the inductance. III. Increasing the initial charge on the capacitor. Question 10: The electric eld in a circular region of radius 12 cm is changing at a rate of 7.8 X II]9 (V/ n1)/ s. W'hat is the mag nitudc of the induced magnetic eld at the edge of this region? Question 11: The diagram below shows three point charges: which make a right angle. -q d H: o d O I Suppose that q = 18 n0 and d = 0.83 mm. What is the magnitude of the net eleetrie force on the charge in the upper right corner? Question 12: A +8.00 point charge is at the origin. A 6.0C point charge is at :L' = 1.5 n1, on the 9: axis. \"Where on the 1:: axis is the electric eld 0? Question 13: At a certain point \"P, the electric eld due to a nearby proton is: E = (3.9, 2.2,0) N/C How far away is the proton from point 73? Question 14: Let's approximate a neuron's axon as a long charged line, with charge-per-length -4.5x10-16 C/m. What is the mag- nitude of the electric field 8.0 um from the axon? (a) 0.17 N/C (b) 0.50 N/C (c) 1.0 N/C (d) 1.3 N/C (e) 2.0 N/C