A parallel plate capacitor stores a charge of 50 mC when a potential difference of 100 V exists between its plates. The charge (in mC) stored in a spherical capacitor with twice the capacitance of the parallel-plate capacitor when a potential difference of 200 V is applied to it is: O 150 200 O 100 25 O 50

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Special Relativity

The theory of special relativity discusses how space and time are related to objects traveling along a straight line at a constant speed. Simply stated, as an object reaches the speed of light, its mass becomes infinite and it is unable to move faster than light. This interstellar speed limit has been the topic of much debate in astronomy, and also in science fiction when people consider how to fly over large distances.