A flat coil has a maximum flux 
through it as its area is perpendicular to a uniform magnetic field. When the coil is rotated 60 
(so that its normal makes a 60
angle with the field), what is the flux through it?
A. 
B. 
C. 
D. 
E. 
D.
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Einstein originally added a cosmological constant to his equations to prevent a presumably static universe from either contracting or expanding
Modern cosmologists have reintroduced it to their equations, where as the source of dark energy it causes the universe to expand ever faster. Indicate whether the statement is true or false
Compared to our Sun, most stars in the halo are
A) old, red, and bright and have fewer heavy elements. B) old, red, and dim and have many more heavy elements. C) young, red, and dim and have fewer heavy elements. D) old, red, and dim and have fewer heavy elements. E) young, blue, and bright and have many more heavy elements.
A long solenoid (1500 turns/m) carries a current of 20 mA and has an inside diameter of 4.0 cm. A long wire carries a current of 2.0 A along the axis of the solenoid. What is the magnitude of the magnetic field at a point that is inside the solenoid and 1.0 cm from the wire?
a. 78 ?T b. 55 ?T c. 48 ?T d. 68 ?T e. 2.0 ?T
In the apparatus shown here, when the switch is open there is not attractive force between the wires. When the switch is closed, the currents are in the same direction and the wires are attracted to each other. If the currents in the two parallel wires were to point in opposite directions, what would be the force between the wires?
a. Attractive. b. Repulsive. c. Zero. d. One is pushed up and the other pushed down. e. Each one pushes the other up.