The segment of wire (total length including portions of incoming and outgoing wire = 6R) is formed into the shape shown and carries a current I. What is the magnitude of the resulting magnetic field at the point P?
A.
B.
C.
D.
E.
Answer: A
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The coil of an ac generator has 50 loops and a cross-sectional area of 0.25 m2. What is the maximum emf that can be generated by this generator if it is spinning with an angular speed of 4.0 rad/s in a 2.0-T magnetic field?
A) 400 V B) 200 V C) 100 V D) 50 V
What is the molarity when water is added to 2 moles of sodium chloride to make 0.5 liter of solution?
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A positive charge Q is located at the center of an imaginary Gaussian cube of sides a. The flux of the electric field through the surface of the cube is ?. A second, negative charge -Q is placed next to Q inside the cube
Which of the following statements will be true in this case? A) The net electric field on the surface of the cube is equal to zero B) The electric field on the surface of the cube is perpendicular to the surface C) The magnitude of the net electric field is constant on the entire surface of the cube D) The net flux through the surface of the cube is equal to zero E) The net flux through the surface is equal to 2?
Helium flash occurs
a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. none of the above