Question

5. A metal bar with length L, mass m, and resistance R is placed on metal rails that are inclined at an angle ? above the horizontal. The coefficient of friction (static and kinematic) is ?. The rails have negligible resistance. A uniform magnetic field of magnitude B is directed sideways as shown. 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) Draw the free-body force diagram of the system (c) What is the terminal speed of the bar? (d) What is the induced current in the bar when the terminal speed has been reached? (e) After the terminal speed has been reached, at what rate is electrical energy being converted to thermal energy in the resistance of the bar?

          5. A metal bar with length L, mass m, and resistance R is placed on metal rails that are inclined at an angle ? above the horizontal. The coefficient of friction (static and kinematic) is ?. The rails have negligible resistance. A uniform magnetic field of magnitude B is directed sideways as shown. 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) Draw the free-body force diagram of the system
(c) What is the terminal speed of the bar?
(d) What is the induced current in the bar when the terminal speed has been reached?
(e) After the terminal speed has been reached, at what rate is electrical energy being converted to thermal energy in the resistance of the bar?

5. A metal bar with length L, mass m, and resistance R is placed on metal rails that are inclined at an angle ? above the horizontal. The coefficient of friction (static and kinematic) is ?. The rails have negligible resistance. A uniform magnetic field of magnitude B is directed sideways as shown. 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) Draw the free-body force diagram of the system
(c) What is the terminal speed of the bar?
(d) What is the induced current in the bar when the terminal speed has been reached?
(e) After the terminal speed has been reached, at what rate is electrical energy being converted to thermal energy in the resistance of the bar?

Added by Antonio V.

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