A planar loop consisting of four turns of wire, each of which encloses 200 cm2, is oriented perpendicularly to a magnetic field that increases uniformly in magnitude from 10 mT to 25 mT in a time of 5.0 ms. What is the resulting induced current in the coil if the resistance of the coil is 5.0 W?
a. 60 mA
b. 12 mA
c. 0.24 mA
d. 48 mA
e. 6.0 mA
D
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Each of the following describes an "Atom 1" and an "Atom 2." In which case are the two atoms isotopes of each other?
A) Atom 1: nucleus with 6 protons and 8 neutrons, surrounded by 6 electrons Atom 2: nucleus with 7 protons and 8 neutrons, surrounded by 7 electrons B) Atom 1: nucleus with 8 protons and 8 neutrons, surrounded by 8 electrons Atom 2: nucleus with 8 protons and 8 neutrons, surrounded by 7 electrons C) Atom 1: nucleus with 92 protons and 143 neutrons, surrounded by 92 electrons Atom 2: nucleus with 92 protons and 146 neutrons, surrounded by 92 electrons D) Atom 1: nucleus with 1 proton and 0 neutrons, surrounded by 1 electron Atom 2: nucleus with 2 protons and 2 neutrons, surrounded by 2 electrons E) Atom 1: nucleus with 4 protons and 5 neutrons, surrounded by 4 electrons Atom 2: nucleus with 5 protons and 5 neutrons, surrounded by 4 electrons
Which of the following hypothetical observations would contradict our theories about the formation and evolution of white dwarfs?
A) discovery of a white dwarf with a surface temperature of 6000 K B) discovery of a white dwarf with a 1.5 Msun mass main-sequence companion C) discovery of a white dwarf with a mass 1.5 times that of the Sun (1.5 Msun) D) discovery of a white dwarf at the center of a planetary nebula
Increasing the speed of waves on a guitar string increases the _________ of the sound it produces
Fill in the blank(s) with correct word
When a charged particle is moved along an electric field line,
a. the electric field does no work on the charge. b. the electrical potential energy of the charge does not change. c. the electrical potential energy of the charge undergoes the maximum change in magnitude. d. the voltage changes, but there is no change in electrical potential energy. e. the electrical potential energy undergoes the maximum change, but there is no change in voltage.