Two charged point particle are located at two vertices of an equilateral triangle and the electric field is zero at the third vertex. we conclude: a) the two particles have charges with opposite signs and the same magnitude b) the two particles have charges with opposite signs and different magnitudes c) the two particles have identical charges d) the two particles have charges with the same sign but different magnitudes e) at least one other charged particle is present

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted