A 10 m long wire carrying a current of 22 A makes an angle of 37
with the Earth's magnetic field of 0.51 mT. What is the magnetic force on the wire?
A. 0.11 N
B. 0.068 N
C. 0.19 N
D. 0.090 N
E. 0.011 N
B. 0.068 N
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How is 21 cm radiation produced?
What will be an ideal response?
The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies
However, studies of the early universe (especially of the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us? A) They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs. B) They do not support the conclusion that dark matter is the dominant form of matter in the universe. C) They tell us that dark matter probably exists, but that it must be made of ordinary (baryonic) matter in the form of MACHOs. D) They tell us that dark matter was produced during the era of nuclei.
What is the approximate surface temperature of a star with weak hydrogen absorption lines and strong absorption lines of ionized calcium?
A) 4,500 K B) 6,500 K C) 5,500 K D) 3,500 K
It is harder to map the structure of the Milky Way in visible wavelengths than with radio and infrared waves
Indicate whether the statement is true or false