A device called a railgun uses the magnetic force on currents to launch projecti

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). A1.2 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 m Ohm resistance and a mass of 4.4 g. Ignore the resistance of the rails. The power supply is switched on. What is the current? Express your answer with the appropriate units. What is direction of the force on the wire?

Explanation / Answer

from the ohm's law

the current is I = V/R

=1.2V/0.85*10^-3

=1411.76 A

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