A capillary tube is connected to a broader tube as shown in the figure.The broader tube contains kerosene oil.If a strong electric field is applied then level of oil in tube:
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D)oscillates up and down
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how strong is the E field?
Not specified i guess
then my best guess is that the level of oil will rise as it is polarised and will try to "even out" the forces on it by creeping up.
some more explanation or detail?
once the oil particles are polarised, they will try to move according to the electric force they are subjected to. As the they are blocked by the capillary tube, they will crawl on each other to form a thin film around the tube.