A beam of monochromatic light passes through a slit that is 11.0 ?m wide. If the first order dark fringe of the resulting diffraction pattern is at an angle of 4.31° away from the centerline, what is the wavelength of light?
A) 602 nm B) 201 nm C) 301 nm D) 402 nm E) 827 nm
E
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A segment of wire carries a current of 25 A along the x axis from x = -2.0 m to x = 0 and then along the y axis from y = 0 to y = 3.0 m. In this region of space, the magnetic field is equal to 40 mT in the positive z direction. What is the magnitude of the force on this segment of wire?
a. 2.0 N b. 5.0 N c. 1.0 N d. 3.6 N e. 3.0 N
Conduction electrons move to the right in a certain wire. This indicates that:
A) the current density points left but the direction of the electric field is unknown B) the current density and electric field both point right C) the current density and electric field both point left D) the current density points right and the electric field points left E) the current density points left and the electric field points right
Heat exchangers are important. Explain their use in power plants, including large scale solar power plants
What will be an ideal response?
A permanent magnet is produced when
A. electrical fields exchange electrons with the magnetic fields. B. electrons become stuck and cease to move. C. current is made to circulate in a clockwise direction in a loop of wire. D. magnetic fields of large groups of individual atoms are permanently aligned.