Energy in Capacitors: An ideal, isolated, air-filled parallel-plate capacitor is not connected to a battery but has equal and opposite charges of 3.9 nC on its plates. The separation between the plates initially is 1.2 mm, and for this separation the capacitance is 3.1 × 10-11 F. How much work must be done to pull the plates apart until their separation becomes 7.7 mm? (?0 = 8.85 × 10-12 C2/N ? m2)
Fill in the blank(s) with the appropriate word(s).
1.3 µJ
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A solenoidal inductor for a printed circuit board is being redesigned. To save weight, the number of turns is reduced by one-half, with the geometric dimensions kept the same. By how much must the current change if the energy stored in the inductor is to remain the same?
1.It must be four times larger. 2.It must be two times larger. 3.It should be left the same. 4.It should be one-half as large. 5.No change in the current can compensate for the reduction in the number of turns.
Suppose we have determined the orbital period of a planet around its star. If we also know the mass of the star, then we can use the planet's orbital period and the star's mass to calculate
A) the planet's average orbital distance. B) mass of the planet. C) eccentricity of the planet's orbit. D) radius of the planet.
Most of the gold, platinum, and rare-earth elements present in the universe are created by neutron star mergers
Indicate whether the statement is true or false
Power: A 150-W light bulb is designed to operate at 110 V dc. How much current does it draw?
A. 0.73 A B. 1.4 A C. 2.0 A D. 15 A