Question

A device called a railgun uses the magnetic force on currents to launch projectiles at very high speeds. An idealized model of a railgun is illustrated in (Figure 1). A 1.2 V power supply is connected to two conducting rails. A segment of copper wire, in a region of uniform magnetic field, slides freely on the rails. The wire has a 0.85 mΩ resistance and a mass of 9.0 g. Ignore the resistance of the rails. At some moment, the power supply is switched on.

Part A What is the current? Express your answer with the appropriate units. I =?

Part D What will be the wire's speed after it has slid a distance of 1.0 mm? Express your answer with the appropriate units. vf v f = nothing nothing

Answer 1