Think of a closed rectangular loop of wire around the edge of a horizontal page. A magnetic field perpendicular to the page points upward and increases in strength in a certain time. During this time the conventional current induced in the loop will be
A. clockwise.
B. continually changing direction.
C. zero.
D. counterclockwise.
Answer: A
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In the Czochralski technique of single-crystal growth, the crystal growth is initiated by epitaxial attachment of atoms to a(n) ___________crystal.
Fill in the blank(s) with the appropriate word(s).
The vertical flight of a helicopter is controlled by ____________.
A. collective pitch changes B. torque and directional control C. angle of attack. D. relative position of the blades during rotation
Which of these is the likely progenitor of a type II supernova?
A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses B) a contact binary, with the neutron star at 2.3 solar masses C) an evolved red giant which is just starting to make silicon in its core D) two white dwarfs in a contact binary system E) an evolved blue supergiant that is about to experience the helium flash
The earliest evidence of prehistoric life is the single-celled organisms called ______________
Fill in the blank(s) with correct word