Julia has bent a conducting wire in the shape as shown below. It consists of two straight sections of length L and a semicircular part of radius R. The current in the wire is I in the counterclockwise direction as shown. If the wire is immersed in a uniform magnetic field into the screen (-x direction), what is the magnetic force on the wire? X B Xp.R

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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.