Qwizdom questions for Feb. 1, 2010

26. 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.

27. 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.

28. 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.

29. The force on a current-carrying wire in a magnetic field is the strongest when A. the current is parallel to the field lines B.the current is at a 30° angle with respect to the field lines C.the current is at a 60° angle with respect to the field lines D.the current is perpendicular to the field lines

29. The correct answer is D, perpendicular to the magnetic field lines.

30. 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.

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