A force of 10 N acts on a charge of 5.0 ?C when it is placed in a uniform electric field. What is the magnitude of this electric field?
A) 50 MN/C
B) 2.0 MN/C
C) 1.0 MN/C
D) 0.50 MN/C
E) 1000 MN/C
B
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A 50-turn circular coil (radius = 15 cm) with a total resistance of 4.0 ? is placed in a uniform magnetic field directed perpendicularly to the plane of the coil. The magnitude of this field varies with time according to B = A sin (?t), where A = 80 ?T and ? = 50? rad/s. What is the magnitude of the current induced in the coil at t = 20 ms?
A. 11 mA B. 18 mA C. 14 mA D. 22 mA E. zero
If the temperature of the Earth cools, how does the carbon dioxide cycle respond?
A) it increases the rate of volcanic eruptions, thus increasing the rate of carbon dioxide production B) it slows the formation of carbonate minerals in the oceans, thus pulling less carbon dioxide out of the atmosphere C) it speeds up the formation of carbonate minerals in the oceans, thus pulling more carbon dioxide out of the atmosphere D) it reduces the rate of volcanic eruptions, thus reducing the rate of carbon dioxide production
Protostars start off more luminous than the main sequence stars they become
Indicate whether the statement is true or false
Four +6.00-µC point charges are at the corners of a square 2.00 m on each side. What is the electric potential of these charges, relative to infinity, at the center of this square? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) 76.4 kV B) 38.2 kV C) 306 kV D) 153 kV E) 61.0 kV