Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT
b. 10 mT
c. 8.0 mT
d. 1.6 mT
e. 7.2 mT
b
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Which of the following is NOT a compound?
A) air B) ammonia C) water D) salt E) all are compounds
Which has a greater mass?
A) four protons B) two neutrons and two protons in a helium nucleus C) A and B both have exactly the same mass.
Two spaceships, each 100 m long in its own rest frame, approach Earth from opposite directions, with equal speeds relative to Earth
As measured by a passenger in one of the spaceships, the other spaceship is 96 m long. What is the speed of the spaceships relative to Earth? A) c/7 B) c/6 C) c/5 D) c/4 E) c/3
Heat can be added to air by solar radiation, moisture
A) condensation, or contact with warm ground. B) evaporation, or contact with warm ground. C) condensation, or contact with cool ground. D) evaporation, or contact with cool ground.