An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. what’s one advantage of using electromagnets in devices?
a. electromagnets have a strong, constant magnetic field.
b. electromagnets are more powerful than permanent magnets.
c. electromagnets don’t need a source of electricity to work.
d. electromagnets can easily be turned on and off.
Answers: 1
Biology, 21.06.2019 13:30, campbellalexus690
Andesitic rocks have mineral compositions between those of and basaltic rocks. a. conglomerate c. granitic b. metamorphic d. organic select the best answer from the choices provided a b c d i need asap
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Biology, 22.06.2019 17:00, maleja2038
Some species of wasps are social. the queen starts a colony from scratch each spring. she builds a small nest, and lays and raises a group of female workers. the workers enlarge the nest while the queen continues to lay eggs. unfertilized eggs become males that mate with newly hatched females. all of the wasps except the newly fertilized females die by the summer. which best describes this behavior? a)it is beneficial only to the males that do not fertilize eggs. b)it is beneficial only to the female workers that are not fertilized. c)it is beneficial to each one of the individual colony members. d)it is beneficial to the whole species, but not to all of the individual members.
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An electromagnet is a device in which moving electric charges (current) in a coil of wire create a m...
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