Suppose you have an inductor whose inductance you want to increase. Just like you can increase the capacitance of a capacitor by placing a polarizable but insulating material between its plates, you can place certain materials inside an inductor to increase its inductance. Which of the following materials would work the best? O Liquid helium Aluminum Liquid oxygen Chromium

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.