Alternating current and voltage (AC), rather than direct current and voltage (DC), are used for domestic electrical power. The reason for this is based on one of the following physical principles. Which one?
A) When a current flows through a resistance, heat is generated.
B) When a current flows through a wire, a magnetic field is created.
C) When the number of magnetic field lines passing through a circuit changes, a voltage is generated in the circuit.
D) When a current-carrying wire is placed in a magnetic field, it may experience a force if properly oriented.
E) Opposite electric charges attract each other, and like charges repel each other.
C
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Arrange the following distances in order from smallest to largest. I. kilometer II. light-year III. yard IV. Astronomical unit
a. I, II, III, IV b. IV, III, II, I c. III, I, IV, II d. II, I, IV, III e. III, I, II, IV
The most information about our environment comes to us through the sense of
a. smell. b. sight. c. hearing. d. touch.
Which of the following is true of a flat Universe?
A) It is two dimensional. B) It closes upon itself. C) It has zero curvature. D) It is finite.
Coulomb's Law: As shown in the figure, charge q1 = 2.2 × 10-6 C is placed at the origin and charge q2 = -3.30 × 10-6 C is placed on the x-axis, at x = -0.200 m. Where along the x-axis can a third charge Q = -8.30 × 10-6 C be placed so that the resultant force on Q is zero?
Fill in the blank(s) with the appropriate word(s).