Which of the following statements is true about a current-carrying wire in a magnetic field?
a. reversing the current direction will cause the force deflecting the wire to be parallel to the velocity of the charge.
b. reversing the current direction will not affect the force deflecting the wire.
c. reversing the current direction will cause the force deflecting the wire to be perpendicular to the magnetic field but in the opposite direction.
d. reversing the current direction will cause the force deflecting the wire to be parallel to the magnetic field.

Spend time observing or thinking about events that involve matter and energy. which events can you explain? which events can’t you explain?

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

This is one type of line graph in which the independent variable is time plotted on the x axis and the dependent variable, also numerical, is plotted on the y axis.