A magnetic field of 3 Tesla is oriented into the page?

Question

A magnetic field of 3 Tesla is oriented into the page. A 10 cm long conducting bar is pulled to the right at a constant speed of 4.4 m/s. Assume the resistor R=2?.

http://session.masteringphysics.com/prob...

a) What is the magnitude of the current in the bar? Express your answer using three significant figures. Answer in A.

b) What is the direction of the current in the bar?

c) What is the power dissipated in the resistor? Answer in W.

d) First, draw a free-body diagram which shows the magnetic force and the applied force applied to the bar. What is the relationship between these forces assuming the bar moves to the right at a constant speed? What is the magnitude of the applied force? Answer in N.

e) What is the direction of the applied force?

f) What is the power supplied by the person pulling the bar? Answer in W. A magnetic field of 3 Tesla is oriented into the page? A magnetic field of 3 Tesla is oriented into the page. A 10 cm long conducting bar is pulled to the right at a constant speed of 4.4 m/s. Assume the resistor R=2?.

http://session.masteringphysics.com/prob...

a) What is the magnitude of the current in the bar? Express your answer using three significant figures. Answer in A.

b) What is the direction of the current in the bar?

c) What is the power dissipated in the resistor? Answer in W.

d) First, draw a free-body diagram which shows the magnetic force and the applied force applied to the bar. What is the relationship between these forces assuming the bar moves to the right at a constant speed? What is the magnitude of the applied force? Answer in N.

e) What is the direction of the applied force?

f) What is the power supplied by the person pulling the bar? Answer in W.

Explanation / Answer

a) induced emf = B*v*L = 3*4.4*0.1 = 1.32 volts

i = emf/R = 1.32/2 = 0.66 A

b) counter clockwise

c) P = i^2*R = 0.66^2*2 = 0.8712 W

d) P = F*v

==> F = P/v = 0.8712/4.4 = 0.198 N

e) right

f) same 0.8712 W

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