The algebraic sum of the changes of potential around any closed circuit loop is
a. zero.
b. maximum.
c. zero only if there are no sources of emf in the loop.
d. maximum if there are no sources of emf in the loop.
e. equal to the sum of the currents in the branches of the loop.
a
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A platinum wire that is 1.20 m long has a radius of 0.500 mm and is fixed at both ends. In its third harmonic it vibrates at 512 Hz. The density of platinum is 21.4 × 103 kg/m3. What is the tension in the wire?
A) 4.00 kN B) 2.00 kN C) 2.82 kN D) 1.41 kN E) 1.00 kN
A charge of 0.80 nC is placed at the center of a cube that measures 4.0 m along each edge. What is the electric flux through one face of the cube?
a. 90 N × m2/C b. 15 N × m2/C c. 45 N × m2/C d. 23 N × m2/C e. 64 N × m2/C
The last minerals to crystallize from a cooling magma have a
A) high melting point and a low silica content. B) low melting point and a high silica content. C) high melting point and a high silica content. D) low melting point and a low silica content.
The internal energy of n moles of an ideal gas depends on
a. one state variable T. b. two state variables T and V. c. two state variables T and P. d. three state variables T, P and V. e. four variables R, T, P and V.