What potential difference is required to cause 4.00 A of current through a resistance of 330 ??
A) 12.1 V
B) 82.5 V
C) 334 V
D) 1320 V
D
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A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm
What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for minimum eyestrain for persons with a near point of 25 cm. A) 1.3 m B) 1.5 cm C) 1.9 cm D) 2.1 cm E) 2.3 cm
If two electrons are near each other and are moving past each other, the electromagnetic forces they exert on each other will be
A) magnetic but not electric. B) electric but not magnetic. C) zero. D) both electric and magnetic.
A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ? m
What is the area of this loop? A) 0.80 m2 B) 0.53 m2 C) 0.40 m2 D) 0.20 m2 E) 0.26 m2
How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?
A) It absorbs a photon equal in energy to its own energy drop. B) It loses kinetic energy. C) It loses gravitational potential energy. D) It releases a photon equal in energy to its own energy drop. E) It exchanges gravitational potential energy for kinetic energy.