The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
a.
directed parallel to the page and downwards.
b.
directed parallel to the page and upwards.
c.
directed parallel to the page and to the right.
d.
directed parallel to the page and to the left.
e.
in a direction that cannot be determined in this experiment
c
You might also like to view...
The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic field in the region is directed in the positive z direction and has a magnitude of 50 mT. The loop can turn about the y axis. If ? = 20°, R = 0.50 m, and I = 12A, what is the magnitude of the torque exerted on the loop?
A. 8.1 N ? m B. 24 N ? m C. 22 N ? m D. 13 N ? m E. 16 N ? m
A racquetball is dropped from a height of one meter. It bounces off the floor and rises to a height of 0.8 m. The collision with the floor was
A. an elastic collision. B. a perfectly inelastic collision. C. a partially inelastic collision. D. impossible to tell without knowing the mass of the ball.
If you move a clock from Earth to the Moon, the clock runs
A) slower. B) no differently. C) faster.
Ellen places an object 48.4 cm from a concave lens. If a virtual image appears 24.6 cm from the lens on the same side as the object, what is the focal length of the lens?
a. –16.3 cm b. –50.0 cm c. 732 cm d. –23.8 cm e. –36.5 cm