sepa and connected to a device that supplies constan current I to the circuit, a shown in Figure 26-42 by

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Needed to be solve both question correctly in 1 hour and get thumbs up please show neat and clean work
•• A metal cross-
bar of mass m rides on a
74
parallel pair of long hori-
zontal conducting rails
separated by a distance L
and connected to a device
that supplies constant
current I to the circuit, as
shown in Figure 26-42.
The circuit is in a region
with a uniform magnetic
field B whose direction is
vertically downward.
There is no friction and
the bar starts from rest at t = 0. (a) In which direction will the bar
start to move? (b) Show that at time t the bar has a speed of
(BIL/m)t.
Constant
current
xL x
source
x x x
FIGURE 26 -42
Problems 74 and 75
Transcribed Image Text:•• A metal cross- bar of mass m rides on a 74 parallel pair of long hori- zontal conducting rails separated by a distance L and connected to a device that supplies constant current I to the circuit, as shown in Figure 26-42. The circuit is in a region with a uniform magnetic field B whose direction is vertically downward. There is no friction and the bar starts from rest at t = 0. (a) In which direction will the bar start to move? (b) Show that at time t the bar has a speed of (BIL/m)t. Constant current xL x source x x x FIGURE 26 -42 Problems 74 and 75
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