Ba điện tích điểm Q1 = 6 , Q2 = –4 và Q3 = 8 đặt tại A, B, C theo thứ tự đó trên một đường thẳng trong không khí. Biết AB = 20cm, BC = 30cm. Tính thông lượng điện trường do hệ ba điện tích trên gửi qua mặt cầu tâm B bán kính 10cm.

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?

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Every winter i fly home to chicago. it takes 3 hours. what is my average speed?