ent # 406 Question 2: Uniform Electric Fields Question 3: Magnetism (Lenz's Law) Question 1: Backed Into a Corner 3 charged spheres are arranged at right angles to each other. For simplicity, consider sphere B to be at the origin. Sphere B has a charge of 5x10* coulombs. Sphere A is fixed in place 0.4 metres above B, and has a charge of 7x10* coulombs. Sphere C is fixed in place 0.6 metres right of B, and has a charge of -8x10* coulombs. a) Draw a diagram showing the initial setup, as well as all distances and charge values. [3C] b) Find the net force (magnitude and direction) on sphere B. [2K 1T 2A] Question 2: A Speedy Electron Assume you have a set of parallel plates which are spaced 5cm apart. Then, you place an electron at rest at the very edge of the negative plate, so that it is 5cm away from the positive plate. Then, you turn the parallel plates on. a) Draw a diagram of the initial setup of the problem showing the parallel plates, the electron, and the electric field lines. [3C] b) What electric field strength is needed to accelerate the electron to a speed of 2.97x10 m/s (99% of the speed of light!) by the time it reaches the positive plate? Ignore relativity (which we haven't learned yet :). [2K 2A] c) What is the potential difference (voltage) needed for the parallel plates to create the electric field from part b? [1K]