Unit C Physics Review

A type of field that is attractive only is

• gravitational

• magnetic

• electric

A student drew field lines around a spherical source. The student did not indicate what kind of field the diagram represented. The student’s diagram most likely represents

• an electric field around a positively charged ball

• an electric field around a negatively charged ball

• a gravitational field around a massive ball

• a magnetic field around a spherical magnet

Which of the following can function as test bodies in a magnetic field?

• grass seeds

• compass needles

• tiny ebony particles

• negatively charged strips of paper

Which of the following objects is a source of a magnetic field?

• an glass rod

• an electrically charged cloud

• a current-carrying coil of wire

• a large iron sphere

Match each description with the appropriate term listed. Place your answer in the blank space given.

• a material that cannot conduct

• field

• space around a mass, magnet, or charge

• conductor

• an object due to an excess of electrons

• positively charged

• a material in which electrons can move

• negatively charged

• an object due to a loss of electrons

• insulator

You have studied the relation between gravitational field strength (g) and the distance (r) from the source of the field. Suppose you wanted to describe this relationship by sketching a graph. Which graph would best represent the relation?

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Position B is twice as far from the centre of a planet than Position A. A rocket moves from Position A to Position B. How does the planet’s gravitational field strength change for the rocket?

• The gravitational field strength increases by a factor of 4.

• The gravitational field strength increases by a factor of 2.

• The gravitational field strength decreases by a factor of 1/2.

• The gravitational field strength decreases by a factor of 1/4.

Suppose two identical balloons are each positively charged and positioned with their centres far enough apart so they are not close to touching each other. The balloons are then moved farther apart so that the distance between their centres doubles. What would be the expected change in the force of repulsion of one balloon on the other due to their increased separation?

• The magnitude of the force of repulsion increases by a factor of 4.

• The magnitude of the force of repulsion decreases by a factor of 4.

• The magnitude of the force of repulsion increases by a factor of 2.

• The magnitude of the force of repulsion decreases by a factor of 2.

• B. 1.26 x 10^7 m

• C. 1.16 x 10^13 m

• D. 3.56 x 10^34 m

• 0.058 N/kg

• 0.12 N/kg

• 0.0058 N/kg

• 0.58 N/kg