Two very long parallel wires carry currents in the positive x direction. One wire (current = 15 A) is coincident with the x axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0). What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm)?
a. 3.8 mT
b. 2.7 mT
c. 2.9 mT
d. 3.0 mT
e. 0.6 mT
B
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A generator is designed to produce a maximum emf of 170 V while rotating at 3200 rpm. The 1525 coils of the generator are circular with diameter 7.5 cm. Assuming the magnetic field in the generator is 0.075 T, what is the necessary magnetic field for the generator?
A. 0.0079 T B. 0.30 T C. 0.075 T D. 0.24
A planet is much more massive than the star it orbits
a. True b. False Indicate whether the statement is true or false
RC Circuits: An uncharged capacitor is connected in series with a resistor, a dc battery, and an open switch. At time t = 0 s, the switch is closed. Which of the graphs below best describes the potential difference V across the capacitor as a function of time t?
A. A B. B C. C D. D E. E
An oxygen molecule falls in a vacuum. From what height must it fall so that its kinetic energy at the bottom equals the average energy of an oxygen molecule at 800 K?
(The Boltzmann constant is 1.38 × 10-23 J/K, the molecular weight of oxygen is 32.0 g/mol, and Avogadro's number is 6.022 × 1023 molecules/mol.) A) 31.8 km B) 10.6 km C) 21.1 km D) 42.3 km