The magnetic field going through a stationary circular loop increases from zero to 5 T in a certain time t. The induced current in the loop will depend on the radius of the loop, r, the resistance of the loop, R, and the time, t. If two of these stay constant, the induced current can be directly proportional to:
a. r.
c. R.
b. t.
d. none of these
D
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Let the charge density in a certain region of space be ?. The electric field 
in that region points in the +x direction with 
increasing as x increases. This implies
A. that ? is positive in that region. B. that ? is negative in that region. C. that ? is zero in that region. D. that the field is physically impossible. E. nothing useful about the charge density.
Which of the following is TRUE?
A) Visible light makes up the greatest part of the electromagnetic spectrum. B) In a vacuum, electromagnetic waves all travel at the same speed, the speed of light. C) Ultraviolet light has the shortest wavelength of any electromagnetic wave. D) A blackbody emits all its radiation at a single wavelength or frequency. E) Electromagnetic waves cannot travel through empty space.
Sirius A and Sirius B constitute a binary star pair in which the stars orbit their common center of mass with a period of 49.9 years. The stars are 2.40 × 1012 m apart
Assume that the two stars have equal masses and that they move in a circle about their common center of mass. What is the mass of each star? G = 6.67 x 10-11 N•m2/kg2. A) 5.41 × 1030 kg B) 2.70 × 1030 kg C) 7.55 × 1030 kg D) 3.30 × 1030 kg E) 1.65 × 1030 kg
An alpha particle is another name for a(n)
a. electron. b. proton. c. neutron. d. helium nucleus. e. photon.