Eventually, all low mass stars will become white, then black, dwarfs
Indicate whether the statement is true or false
TRUE
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A long, straight wire carries a current I (Fig. OQ30.8). Which of the following statements is true regarding the magnetic field due to the wire? More than one statement may be correct
A planar cross section through two spherical waves emanating from the sources S1 and S2 in the plane is shown in the figure. S1 and S2 are in phase. The black circles are one and two wavelengths from their respective sources. The lighter circles are one half and one and a half wavelengths distant from their respective sources. If the waves shown arriving at P2 both arrive with amplitude A, the resultant amplitude at point P2 is
A.
B.
.C.
D.
.E.
Terminal Voltage and Internal Resistance: A battery has an emf ? = 12 V and an internal resistance r = 2.0 ?, as shown in the figure. When a current of 6.0 A is drawn from the battery, the terminal voltage of the battery Vab is closest to
A. 0 V. B. +12 V. C. +24 V. D. 2.0 V. E. 10 V.
Four point charges are on the rim of a circle. The charges are (in mC) +0.50, +3.0, -1.0, -0.50 . If the electrical potential at the circle's center due to the +0.5 charge alone is 4.5 × 10^4 V, what is the total potential at the center due to the four charges combined?
a. 18 × 10^4 V c. zero b. 4.5 × 10^4 V d. -4.5 × 10^4 V