A proton moves across the Earth's equator in a northeasterly direction. At this point the Earth's magnetic field has a direction due north and is parallel to the surface. What is the direction of the force acting on the proton at this instant?
a. toward the northwest
b. out of the Earth's surface
c. into the Earth's surface
d. toward the northeast
b
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A straight wire of length l is oriented east-west and is in a magnetic field B pointing north. The wire is moving downward at a constant speed v. Which end of the rod is positively charged?
a. neither b. the east end c. the west end d. both ends
There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper. If the magnetic field B is toward the right, and if each side of the loop has length L, then the net magnetic torque acting on the loop is
a.
2ILB.
b.
ILB.
c.
IBL2.
d.
zero.
Consider an LRC series circuit. The impedance of the circuit increases if XC increases. When is this statement true?
A) always true B) true only if XL is less than or equal to XC C) true only if XL is greater than XC D) true only if XL is equal to XC E) never true
If satellite A is in a 2:1 resonance with satellite B, this means that:
A) satellite A is twice as large as satellite B. B) satellite A moves twice as fast as satellite B. C) satellite A completes one orbit for every two orbits of satellite B. D) the orbit of satellite B takes twice as long to complete as that of satellite A. E) satellite B spins on its axis one time for every two orbits of satellite A.