View the step-by-step solution to:

# A metal bar with length L, mass m, and resistance R is placed on a frictionless metal rails that are inclined at an angle phi above the horizontal....

A metal bar with length L, mass m, and resistance R is placed on a frictionless metal rails that are inclined at an angle phi above the horizontal.  The rails have negligible resistance.  A uniform magnetic field B is directed downward on the figure (see attachment).  The bar is released from rest and slides down the rails.
a) Is the direction of the current induced in the bar from a to b, or from b to a?
b) What is the terminal speed of the bar?
c) What is the induced current in the bar when the terminal speed has been reached?
d) after the terminal speed has been reached, at what rate is electrical energy being converted to thermal energy?
answer: P = I^2*R = ((m*g/B*L)*tan(phi))^2 * R
e) After the terminal speed has been reached, at what rate is work being done on the bar by gravity?
This one I have no clue how to answer
I thought it would be:  W = F*v = mg*((mg*R*sin(phi))/(B*L*cos(phi))^2
but this is not the right answer.

### Why Join Course Hero?

Course Hero has all the homework and study help you need to succeed! We’ve got course-specific notes, study guides, and practice tests along with expert tutors.

### -

Educational Resources
• ### -

Study Documents

Find the best study resources around, tagged to your specific courses. Share your own to gain free Course Hero access.

Browse Documents