How does a magnetic field cause electric charges to form an electric current? A. Negative charges and positive charges are pushed in the same
direction by the magnetic field.
B. Negative charges and positive charges are pushed in opposite
directions by the magnetic field.
C. A force is exerted by the magnetic field on only the positive
charges in the wire.
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D. A force is exerted by the magnetic field on only the negative
charges in the wire.

The x-coordinate of a particle in curvilinear motion is given by x = 3.1t3 - 4.9t where x is in feet and t is in seconds. the y-component of acceleration in feet per second squared is given by ay = 2.3t. if the particle has y-components y = 0 and vy = 5.0 ft/sec when t = 0, find the magnitudes of the velocity v and acceleration a when t = 1.8 sec. sketch the path for the first 1.8 seconds of motion, and show the velocity and acceleration vectors for t = 1.8 sec. answers: v = ft/sec a = ft/sec2