A sort of projectile launcher is shown in (Figure 1). A large current moves in a

Question

A sort of projectile launcher is shown in (Figure 1). A large current moves in a closed loop composed of fixed rails, a power supply, and a very light, almost frictionless bar (pale green) touching the rails. A magnetic field is perpendicular to the plane of the circuit. Part A If the bar has a length l = 26 cm , a mass of 1.7 g , and is placed in a field of 1.5 T , what constant current flow is needed to accelerate the bar from rest to 25 m/s in a distance of 1.5 m Express your answer to two significant figures and include the appropriate units. Part B In what direction must the magnetic field point? Upward downward

Explanation / Answer

Here ,

for final speed , v = 25 m/s

d = 1.5 m/s

Using third equation of motion

2*a* 1.5 = 25^2

a = 208.3 m/s^2

Now, using second law of motion

F = m* a

B*I*L = m* a

1.5 * 0.26 * I = 0.0017 * 208.3

I = 0.908 A

the current is 0.908 A

B)

magnetic field should be Downwards

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