Self-Inductance: The figure shows a solenoid having no appreciable resistance. When the current in this solenoid is decreasing at a rate of 5.5 A/s, the self-induced emf in the solenoid is measured to be 9.5 V.(a) What is the self-inductance of this solenoid?(b) If the current is in the direction from b to a in the figure, which point, a or b, is at higher potential?
What will be an ideal response?
(a) 1.7 H (b) point b
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The surface water temperature on a large, deep lake is 3°C. A sensitive temperature probe is lowered several m into the lake. What temperature will the probe record?
A) a temperature warmer than 3°C B) a temperature less than 3°C C) a temperature equal to 3°C
A long cylindrical shell (radius = 2.0 cm) has a charge uniformly distributed on its surface. If the magnitude of the electric field at a point 8.0 cm radially outward from the axis of the shell is 85 N/C, how much charge is distributed on a 2.0-m length of the charged cylindrical surface?
A. 0.38 nC B. 0.76 nC C. 0.19 nC D. 0.57 nC E. 0.98 nC
Which layer of the Sun do we see with our eyes?
A) photosphere B) corona C) chromosphere D) convection zone E) radiation zone
Which of these was NOT seen telescopically by Galileo?
A) sunspots B) Venus' phase cycle C) stellar parallax D) four moons around Jupiter E) craters and mare on the Moon