A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m?, what is the magnetic force on the moving bar?
a.
0.48 N to the right
b.
0.48 N to the left
c.
0.32 N to the left
d.
0.32 N to the right
e.
None of the above
b
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What will be an ideal response?
The figure shows a ‘snapshot’ of four different waves in identical ropes stretched with the same force
The wave with the largest frequency is
a.
I.
b.
II.
c.
III.
d.
IV.
e.
all of the above.
Which model of the universe gives the youngest age for its present size and expansion rate?
A) a critical universe B) an accelerating universe C) a re-collapsing universe D) a coasting universe E) All models give the same age.
Flux: A rectangular loop of wire that can rotate about an axis through its center is placed between the poles of a magnet in a magnetic field with a strength of 0.40 T, as shown in the figure. The length of the loop L is 0.16 m and its width w is 0.040 m. What is the magnetic flux through the loop when the plane of the loop is perpendicular to the magnetic field?
A. 13 × 10-3 T ? m2 B. 2.6 × 103 T ? m2 C. 0.80 T ? m2 D. 2.6 × 10-3 T ? m2 E. 0 T ? m2