(6 points) Match the following demonstrations performed in class with the key concept that was illustrated. Write the appropriate letter to the left of the question number. 1. A compass needle moving when placed a. Electromagnetic induction near a working circuit. b. Refraction 2. Pie pans flying off of the Van de Graaf generator. c. A current leads to a magnetic field. 3. A magnet moved into and out of a conductive coil d. Reflection of wire leads to a measurable current. e. Like charges repel. 4. Using a lens and a light source to show light rays f. Opposite charges attract. spreading as they pass from the air through the lens. 5. Rubbing a plastic rod with fur, placing the rod on a spinning stand and placing the fur near the rod; the rod spins towards the fur. 6. Using a mirror and a light source to show light rays bouncing off the mirror