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This set of questions explains the interaction between bar magnets, the behavior of compass needles, and the effects of electric currents on magnetic fields. It also asks about the direction of magnetic fields and their effects on moving charged particles.
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If the north poles of two bar magnets are brought close to each other, the magnets will A. attract B. repel
26. The correct answer is B, repel.
The south pole of the needle of a standard compass points toward the Earth's geographic A. south pole B. north pole C. center
27. The answer is A, the south pole.
A DC electric current produces • A. a gravitational field • B. an electric field • C. a magnetic field • D. an electromagnetic field
28. The answer is C, a magnetic field.
The force on a current-carrying wire in a • magnetic field is the strongest when • A. the current is parallel to the field lines • the current is at a 30° angle with respect to the field lines • the current is at a 60° angle with respect • to the field lines • the current is perpendicular to the field • lines
29. The correct answer is D, perpendicular to the magnetic field lines.
An electron has an initial velocity to the • south but is observed to curve upward • as the result of a magnetic field. The • direction of the magnetic field is • A. to the west • B. to the east • C. upward • D. downward
30. The correct answer is A, the magnetic field points west.
