A high-voltage power line 20 m above the ground carries a current of 5000 A. What is the magnetic field due to the current directly underneath the power line? (µ0 = 4p × 10^-7 T×m/A)
a. 14 mT
c. 20 µT
b. 35 µT
d. 50 µT
D
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Indicate whether the statement is true or false
Describe the primary difference between the northern and southern hemispheres on Mars
What will be an ideal response?
FM radio only operates in the frequency range 88 MHz to 108 MHz because
a. higher or lower frequencies are blocked by the ionosphere b. higher and lower frequencies are not radio waves c. the government set those limits d. none of the above
A room is heated with electric resistance wires embedded in the 2.2 m high ceiling. Estimate the heat transfer per unit of floor area when the ceiling is at 80ºC and the floor is 10ºC. Neglect any radiation and heat transfer between the walls of the room.
What will be an ideal response?