I need help on B and D ! A device called a railgun uses the magnetic force on cu

Question

I need help on B and D !

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 0.92 m ohm resistance and a mass of 4.8 g. Ignore the resistance of the rails. The power supply is switched on. What s direction of the force on the wire? left down up right What is the magnitude of the force on the wire? Express your answer with the appropriate units. F = 160 N What will be the wire's speed after it has slid a distance of 4.0 cm? Express your answer with the appropriate units. upsilon_f = ______ m/s

Explanation / Answer

b) Direction is to the right
Since B is into page
So LxB is to the right

d)
F = ma
=> a = F/m
=> a = 160/0.0048
=> a = 33333.33 m/s^2

vf = sqrt(2as)
=> vf = sqrt(2*33333.33*0.04)
=> vf = 51.64 m/s (or 52 m/s rounded off)

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