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10. a. Explain why a current carrying wire can be thought of as a "magnet". b. Explain why two long current carrying parallel wires should exert forces on each other. Also is the force attractive or repulsive? 1=0.5A 1=0.5A 11. Three positive point charges of equal magnitude are arranged on three of the corners of an equilateral triangle with side d as shown in the figure. Sketch the net electric force acting on the charge at the top of the triangle. Draw a FBD of the charge at bottom left of triangle. Use head-to-tail method to determine the direction of the net force. Comment on the relative engths of the vectors