Physics B - Unit 7 Review

Like charges

• repel

• attract

Unlike charges

• repel

• attract

A negatively charged object touches a metallic object and causes it to have a charge. What is this phenomenon called?

• induction

• conduction

• circuit formation

• grounding

Two neutral spheres are touching. A negatively charged object comes close but does not touch one of the spheres. The spheres are then separated and each has a charge, one positive and one negative. What is this phenomenon called?

• induction

• conduction

• circuit formation

• grounding

A 1.0 µC test charge travels along an equipotential line a distance of 0.20 cm between two parallel charged plates with a field strength of 500.00 N/C. What is the change in voltage? μC=1.0×10−6 C

• -100 V

• 0 V

• +100 V

• +1,000 V

Which substance is most easily grounded?

• plastic foam plate

• copper rod

• rubber tire

• PVC pipe

An attractive force of 7.2 N occurs between two point charges that are 0.10 m apart. If one charge is −4.0 μC, what is the other charge? μC=1.0×10−6C (Hint: use Coulombs law)

• −4.0 μC

• −2.0 μC

• +2.0 μC

• +4.0 μC

A 2.0 µC point charge travels a distance of 0.20 cm between two parallel charged plates from the negative end toward the positive end. The electric field has a strength of 500.0 N/C. What is the change in voltage? μC=1.0×10−6 C

• +1.0 V

• -100 V

• 0 V

• +0.20 mV

If 8.0×10−18 J of work is done to increase the electric potential difference of a test charge by 50.0 V, what is the magnitude of the charge?

• 1.6×10−19 C

• 4.0 ×10−19 C

• 1.6 ×10−18 C

• 4.0 ×10−1 C

Which of the following is an example of static electricity?

• outdoor light

• lights arranged in series

• hair clinging to a comb

• glowing toaster filament