A wire is lying horizontally in the north-south direction and the horizontal magnetic field is toward the east. Some positive charges in the wire move north and an equal number of negative charges move south. The direction of the force on the wire will be:
a.
east.
b.
down, into the page.
c.
up, out of the page.
d.
There is no magnetic force.
b
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Capacitors in Combination: When two or more different capacitors are connected in series across a potential source, which of the following statements must be true? (There could be more than one correct choice.)
A. The total voltage across the combination is the algebraic sum of the voltages across the individual capacitors. B. Each capacitor carries the same amount of charge. C. The equivalent capacitance of the combination is less than the capacitance of any of the capacitors. D. The potential difference across each capacitor is the same. E. The capacitor with the largest capacitance has the most charge.
A 1.6-kg block is attached to the end of a 2.0-m string to form a pendulum. The pendulum is released from rest when the string is horizontal. At the lowest point of its swing when it is moving horizontally, the block is hit by a 10-g bullet moving horizontally in the opposite direction. The bullet remains in the block and causes the block to come to rest at the low point of its swing. What was
the magnitude of the bullet's velocity just before hitting the block? a. 1.0 km/s b. 1.6 km/s c. 1.2 km/s d. 1.4 km/s e. 1.8 km/s
The "color" of light produced by a light bulb is measured in what unit?