PLEASE HELP 5TH GRADE SCIENCE! Charlotte completed an experiment in which she investigated and discovered that an electrically charged object can attract an uncharged object without any contact. She used a PVC pipe and small pieces of paper for her experiment. Each time, she rubbed the PVC pipe with a cloth to give it a charge and then held it over paper. What would be Charlotte's control group in this experiment?

A. Using the cloth and rubbing it against the PVC pipe
B. Taking the pieces of paper and rubbing it against the cloth
C. Not rubbing the cloth against the PVC pipe or the paper
D. Rubbing the cloth against both the paper and the PVC pipe

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Ain is , is 's of ? 0.62 0.79 1.27 1.50