Equal charges, one at rest, the other having a velocity of 104 m/s, are released in a uniform magnetic field. Which charge has the largest force exerted on it by the magnetic field?
a. The charge that is at rest.
b. The charge that is moving, if its velocity is parallel to the magnetic field direction when it is released.
c. The charge that is moving if its velocity makes an angle of 45o with the direction of the magnetic field when it is released.
d. The charge that is moving if its velocity is perpendicular to the magnetic field direction when it is released.
e. All the charges above experience equal forces when released in the same magnetic field.
d
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Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds
A) increases. B) remains constant. C) decreases. D) cannot be determined from the information given.
Coulomb's Law: Four point charges of equal magnitude but with varying signs are arranged on three of the corners and at the center of the square of side d as shown in the figure. Which one of the arrows shown represents the net force acting on the center charge?
A. A B. B C. C D. D
Two different masses have equal, non-zero kinetic energies. The momentum of the smaller mass is
A) smaller than the momentum of the larger mass. B) larger than momentum of the larger mass. C) equal to the momentum of the larger mass. D) zero. E) There is not enough information to answer the question.
A jet traveling at 1500 km/h passes overhead. The sonic boom produced is heard by
A) a listener on the ground. B) the jet pilot. C) both of these D) neither of these