A uniform magnetic fi eld cannot exert a magnetic force on a particle in which of the following circumstances? (There may be more than one correct statement.) (a) The particle is charged. (b) The particle moves perpendicular to the fi eld. (c) The particle moves parallel to the fi eld. (d) The magnitude of the magnetic fi eld changes with time. (e) The particle is at rest.

• pH and Acid/Base Balance • What is pH – Can be thought of as the power of Hydrogen concentration in a solution – Mathematical definition- negative logarithmic value of the hydrogen ion (H+) concentration, or • pH = -log [H+] – Negative Logarithm- a negative scale based on ten • As the hydrogen ion concentration goes up, the scale goes down • Example: 1 is ten times more that 2 » 3 is a hundred time less than 1 (10 x 10 = 100) • What is the pH for an Acid Neutral A base • pH of Common Products • Physiological pH • Normal body pH is between 7.35-7.45 or ~ 7.4 • So,