6. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to: A.The heating effect of current alone B.Hysteresis loss alone C.Both the heating effect of current and hysteresis loss D.Intense sunlight at noon
Answer: Option A Solution: The uptake of water can be measured using a potometer. Under normal circumstances, the rate of water uptake gives a measure of the rate of transpiration . A simple potometer is a piece of capillary tubing to which a plant has been connected. Ganong's potometer is the right answer.
