CP07 Review

Two charged spheres are 4 cm apart. If the spheres are moved closer to each other so that they are 2 cm apart what will occur to the force?

• The force between the spheres will decrease by a factor of 4.

• The force between the spheres will decrease by a factor of 2.

• The force between the spheres will increase by a factor of 4.

• The force between the spheres will increase by a factor of 2.

Which of the following best describes the outcome when a positively charged glass rod is touched to a neutral metal sphere?

• The metal sphere gains electrons and becomes negatively charged.

• Electrons from the metal sphere move to the glass rod, leaving the sphere with a net positive charge.

• The metal sphere remains neutral.

• The metal sphere becomes magnetized.

What is the mathematical formula for Coulomb's Law?

• F = ma

• F = qE

• F = B I l

• F = k (q1 q2) / r^2

If the distance between two point charges is doubled, how does the force between them change?

• It doubles

• It decreases by a factor of four

• It halves

• It quadruples

What is Coulomb's constant?

• 1.3x10^-11 N*m^2/C^2

• 9.0x10^9 N*m^2/C^2

• 6.11x10^-7 N*m^2/C^2

• 4.2x10 N*m^2/C^2

What is the force between two 3.0 X 10^-4 C charges separated by 3.0 m?

• 9.0 N

• 0.9 N

• 900 N

• 8.7 N

How does a simple motor work?

• By changing magnetic flux to change circuit voltage

• By using electricity to make a loop of wire rotate in a magnetic field

• By rotating a magnet to generate electricity

• By physically pushing a loop of wire to create a magnetic field

Which of the following materials is the best conductor of electricity?

• Rubber

• Glass

• Copper

• Wood

In which type of circuit are the components arranged in a single closed loop?

• Series circuit

• Parallel circuit

• Parallel circuit

• Complex circuit

What kind of circuit is this an example of?

• Complex circuit

• Mixed circuit

• Parallel

• Series