At a distance of 10 km from a radio transmitter, the amplitude of the E field is 0.20 volts/meter. What is the total power emitted by the radio transmitter?
a. 10 kW
b. 67 kW
c. 140 kW
d. 245 kW
e. 21 kW
b
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What is the source of the magnetic field in the Crab Nebula? What is at the very center?
A.) A black hole. B.) A neutron star. C.) A white dwarf. D.) Nothing. The star blew itself up. E.) An excited Nebula.
A square is 1.0 m on a side. Point charges of +4.0 ?C are placed in two diagonally opposite corners. In the other two corners are placed charges of +3.0 ?C and -3.0 ?C
What is the potential (relative to infinity) at the midpoint of the square? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 1.0 × 104 V B) 1.0 × 105 V C) 1.0 × 106 V D) 0 V E) infinite
If the breakers at a beach are separated by 5.0 m and hit shore with a frequency of 0.20 Hz, with what speed are they traveling?
A “free” electron and a “free” proton are placed in an identical electric field. Is the following statement true or false?
The electric force on the proton is equal in magnitude to the electric force on the electron, but in the opposite direction.
1.False 2.True