Choose the correct definition for a closed switch.
a. the current through it is zero.
b. the voltage across it can be any value depending on the circuit the current that varies either in magnitude or direction with time.
c. the voltage across it is zero. the current through it can be any value depending on the circuit.
d. the current is constant in magnitude and direction with respect to time.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.