Consider the circuit shown in the following figure (Figure 1) , but with the bar moving...
Consider the circuit shown in the following figure (Figure 1) , but with the bar moving to the right with speed v. The bar has length 0.372m , R = 47.8? , and B = 0.620T .
Part A:
Is the induced current in the circuit clockwise or
counterclockwise?
Part B:
At an instant when the resistor is dissipating electrical energy at a rate of 0.928J/s , what is the speed of the bar?
Express your answer with the appropriate units.
Homework Answers
A.
By Lenz law, the current must counter the change in B flux out of the page, which forces the current to be CLOCKWISE. [ANSWER]
B.
Here,
emf = B v l
As
P = (emf^2)/R
Then
P = B^2 v^2 l^2 / R
Solving for v,
v = sqrt [P R / [B^2 l^2]]
Thus,
v = 28.9 m/s [ANSWER]
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