A charged particle (mass = M, charge = Q> 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
A. QVB toward the east
B. Zero
C. QVB toward the west
D. QVB upward
E. QVB toward the south
Answer: C
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A sample of an ideal gas has a volume of 0.00100 
a pressure of 4.50 atmospheres and 
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A. 154 K B. 165 K C. 173 K D. 186 K E. 194 K
A monochromatic light beam is incident on the surface of a metal having a work function of 2.50 eV. If a 1.0-V stopping potential is required to make the electron current zero,
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State the physical characteristics of the three types of radiation from radioactive sources
Force on a Wire: A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E, as shown in the figure. It is placed in a uniform magnetic field of 0.55 T in the same plane, directed as shown on the right side of the figure. The figure indicates the dimensions of the wire. Note that AB is parallel to DE and to the baseline from which the magnetic field direction is measured. What are the magnitude and direction of the force acting on section CD of this wire?
A. 0.066 N perpendicular into the page B. 0.40 N perpendicular out of the page C. 0.066 N perpendicular out of the page D. 0.40 N perpendicular into the page E. 0.20 N perpendicular out of the page