When two or more capacitors are connected in series to a battery,
A)
the total voltage across the combination is the algebraic sum of the voltages across the individual capacitors.
B)
each capacitor carries the same amount of charge.
C)
the equivalent capacitance of the combination is less than the capacitance of any of the capacitors.
D)
all of the given answers
E)
none of the given answers
D
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Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
a. 22 J b. 16 J c. 13 J d. 19 J e. 8.0 J
A silver bar of length 30 cm and cross-sectional area 2.0 cm2 is used to transfer heat from a 100°C reservoir to a 0°C block of ice. How much ice is melted per second? (For silver, k = 427 W / m • °C. For ice, Lf = 334,000 J/kg.)
a. 4.2 g/s c. 0.80 g/s b. 0.085 g/s d. 0.043 g/s
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? 1 Ci = 3.7 × Bq
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If an object remains at rest, then the sum of both the external torques and the external forces on the object must be zero
A) True B) False