Final Exam (Day 1)

How can the direction of a magnetic field be identified at any given location?

• the direction that is perpendicular to Earth's magnetic field

• the direction toward which the north pole of a compass needle points

• he direction that is parallel to the imaginary magnetic field lines

• the direction toward the nearest magnet

2. Which statement describes Kepler's third law?

• The square of the orbital period is proportional to the square of the orbit's semimajor axis.

• The cube of the orbital period is proportional to the cube of the orbit's semimajor axis.

• The cube of the orbital period is proportional to the square of the orbit's semimajor axis.

• The square of the orbital period is proportional to the cube of the orbit's semimajor axis.

Where is the magnitude of the magnetic field around a permanent magnet greatest?

• It is greatest closest to the poles

• The magnitude depends on the material from which the magnet is made.

• It is greatest farthest from the poles.

• The magnitude is equal at all points in the field.

One astronomical unit is equal to the average distance between Earth and the sun, or 1.496 x 10^8 km.

• True

• False

When electrons move through a metal conductor,

• they move in a straight line through the conductor

• they move in zigzag patterns because of repeated collisions with the vibrating metal atoms.

• they move at the speed of light in a vacuum.

• the temperature of the conductor decreases.

An increase in which of these will increase the drift velocity of electrons in a wire?

• Temperature

• electric field strength

• electric resistance

• wire insulation

The equation for gravitational force is an inverse-square relationship. The force of gravity is directly proportional to the square of the distance

• True

• False

Which of the following symbols represents the constant of universal gravitation?

• G

• g

• Fc

• Fg

A bar magnet is broken into halves at the line separating the north and south poles. Which statement is true about the two new pieces?

• The pieces have turned into ferromagnetic material.

• Each piece has turned into a bar magnet with its own north and south poles.

• The pieces have lost their magnetic ability.

• ach piece has turned into a single pole magnet, resulting in one individual north pole and one individual south pole.

10. How can ferromagnetic material become magnetized?

• by being placed in the presence of a permanent magnet

• by being connected to the terminals of a strong battery

• by being placed in the presence of a temporary magnet

• by being connected to a long wire with low resistance