Charges q and Q are placed on the x axis at x = 0 and x = 2.0 m, respectively. If q = ?40 pC and Q = +30 pC, determine the net flux through a spherical surface (radius = 1.0 m) centered on the origin
a. ?9.6 N / m2/C
b. ?6.8 N / m2/C
c. ?8.5 N / m2/C
d. ?4.5 N / m2/C
e. ?1.1 N / m2/C
d
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A long steel rod (2 cm in diameter, 2-m-long) has been heat-treated and quenched to a temperature of 100°C in an oil bath. To cool the rod further, it is necessary to remove it from the bath and expose it to room air. Will the faster cool-down result from cooling the cylinder in the vertical or horizontal position? How long will the two methods require to allow the rod to cool to 40°C in 20°C air?
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