Problem 27.69 16 of 17 Constants Part A A sort of \"projectile launcheris shown

Question

Problem 27.69 16 of 17 Constants Part A A sort of "projectile launcheris shown in the tlqure (Figure 1)A arge current moves in a closed loop composed of foxed rais, a power supply, and a very ight, aimonl frictionless bar bouching the rals. A 0.80 T magnetic feld is perperdioular to the plane of the If f the rais ave a dstance d- 20 em apart, and the bar han a mass of 0g.whe constant current flow is needed to acceierale the ber from reat to 20 ms n a distance of 1.3m Express your answer to two significant figures and include the appropriate units. I 1.5625 Submit Previous Anewers Brauest Answer Incorrect; Try Again; 5 attempts remaining Part B n what Sirection must the feld point? Figure Correct

Explanation / Answer

given magnetic field B = 0.8 T
current i = ? ( current)
distance between rails, d = 0.2 m
mass of bar, m = 0.001 g
distance, s = 1.3 m
initial speed, u = 0 m/s
final speed, v = 20 m/s
hence

acceleration, a
2*a*s = v^2 - u^2
a = 153.846153 m/s/s
force F = ma = 0.15384615384 N
but F = B*i*d
hence
i = 0.96153846153 A

fro the left hand rule, the magnetic field must point in the downward direction, perpendicular to the plane containing therails and the mass

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