A segment of wire of total length 2.0 m is formed into a circular loop having 5.0 turns. If the wire carries a 1.2-A current, determine the magnitude of the magnetic field at the center of the loop
a. 79 mT
b. 69 mT
c. 59 mT
d. 89 mT
e. 9.4 mT
C
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Moment of Inertia: A triatomic molecule is oriented as follows along the x-axis: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. What is the moment of inertia of this molecule about the y-axis?
A. 2ma2 B. 3ma2 C. 12ma2 D. 14ma2
A 0.10 kg piece of copper, initially at 95°C, is dropped into 0.20 kg of water contained in a 0.28-kg aluminum can; the water and aluminum are initially at 15°C. What is the final temperature of the system?
A) 19.2°C B) 7.89°C C) 18.3°C D) 17.8°C E) 23.7°C
An open circuit consists of a 12 ?F parallel plate capacitor charged to 200 V and a 10 ? resistor. At the instant when a switch closes the circuit (with no battery in it) the displacement current between the plates of the capacitor is
a. 1.2 ?A. b. 2.4 × 10^?4 A. c. 2.4 mA. d. 10 A. e. 20 A.
The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. nearby presence of photons of same wavelength as those emitted b. high flux of electrons c. high voltage d. high temperature