When the number of turns in a solenoid and its length are both doubled, the ratio of the magnitude of the new magnetic field inside to the magnitude of the original magnetic field inside is what?
a. 0.25
b. 0.50
c. 1
d. 2
e. 4
c
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Heat Engines: A heat engine has an efficiency of 31.4% and receives 8.72 kJ of heat per cycle.(a) How much work does it perform in each cycle?(b) How much heat does it exhaust in each cycle?
What will be an ideal response?
Normal atmospheric pressure is about __________
Fill in the blank(s) with correct word
How is the sunspot cycle directly relevant to us here on Earth?
A) The sunspot cycle strongly influences Earth's weather. B) The Sun's magnetic field, which plays a major role in the sunspot cycle, affects compass needles that we use on Earth. C) The brightening and darkening of the Sun that occurs during the sunspot cycle affects plant photosynthesis here on Earth. D) Coronal mass ejections and other activity associated with the sunspot cycle can disrupt radio communications and knock out sensitive electronic equipment. E) The sunspot cycle is the cause of global warming.
When E and B are the amplitudes of the electric and magnetic fields in an electromagnetic wave in vacuum, the total average energy density in the wave is
A.
.B.
.C.
D.
.E.
.