Two current loops are coaxial and coplanar. One has radius a and the other has radius 2a. Current 2I in the outer loop is antiparallel to currentIin the inner loop. The magnitude of the magnetic field at the center of the two loops is
A.
B.
.C.
.D.
.E.
.Answer: A
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Each atom in a mole of water vapor (H2O) has one electron removed. What is the total charge of the ionized gas?
A. 96 kC B. 290 kC C. 600 kC D. 190 kC
Rotational Dynamics: A mechanic is examining the wheel of a bicycle to adjust the brake. With the bicycle off the ground, he manually rotates the wheel until it reaches an angular speed of 12.0 rad/s and then allows it to coast to a stop. If the wheel has a moment of inertia of 0.100 kg ? m2, and the wheel slows uniformly to a stop in 160 s, what is the magnitude of the retarding torque?
A. 1.00 N ? m B. 0.00750 N ? m C. 0.0787 N ? m D. 1.33 N ? m E. 1.67 N ? m
In which type of collision is the most kinetic energy lost?
A. A perfectly elastic collision B. A perfectly inelastic collision C. A partially inelastic collision D. Kinetic energy is always conserved
In this course we have seen that baryons have inertial and gravitational mass, intrinsic angular momentum, and other internal properties that have been given names like baryon number, strangeness, charm, etc. The Standard Model's explanation for these properties of baryons is that
a. the baryons are states of something more elementary that can exist in multiple quantum states. b. the leptons are states of something more elementary that can exist in multiple quantum states. c. photons are states of something more elementary that can exist in multiple quantum states. d. according to the Heisenberg Uncertainty Principle quantum numbers are indeterminate. e. quarks are states of something more elementary that can exist in multiple quantum states.