Explain why water droplets at the bottom of a thundercloud become 2 points negatively charged. Your answer When drying a synthetic-fibre shirt in a clothes dryer along with other 2 points clothes, the shirt gained a surplus of 1.7 x 1013 electrons. Determine the charge, expressed in coulombs, on the shirt. Include the sign of the charge. Show your work. Your answerThe failure of a student-built motor during initial testing is usually due to the 2 points brush design. Explain why it is important to have the brushes exert just the right amount of pressure. Your answer Refer to the following diagram. After testing this student-built motor, the 2 points student saw the armature consistently turning in one direction. Describe two changes in the motor's design that would cause the armature to turn in the opposite direction. Your answerThe output from a current generator is described by the following 2 points illustration. Explain why the voltage goes to zero during part of each cycle and why the voltage magnitude peaks during part of each cycle. input of mechanical energy to turn axle Your answer Thry