Two long parallel wires 40 cm apart are carrying currents of 10 A and 30 A in the same direction. What is the magnitude of the magnetic field halfway between the wires?
a. 4.0 × 10^–5 T
c. 3.0 × 10^–5 T
b. 1.0 × 10^–5 T
d. 2.0 × 10^–5 T
D
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Ridges in the middle of the ocean are places where
A) one plate slides under another, returning older crust to the mantle. B) hot mantle material rises upward, creating volcanic islands. C) hot mantle material rises upward and spreads sideways, pushing the plates apart. D) plates push together, creating ocean mountain chains. E) plates slip sideways relative to one another.
A metallic surface is illuminated with light of wavelength 400. nm. If the work function for this metal is 2.4 eV, calculate the kinetic energy of the ejected electrons, in electron-volts
What will be an ideal response?
When sound travels faster higher in the air than it does closer to the ground, sound bends
A) upward. B) downward. C) neither of these
Ice melts at
A. 0 K B. 0 C C. 0 F D. 100 C