When combing one's hair, the comb becomes positively charged. What happens to the hair being combed?
Responses
It loses electrons.
It loses electrons.
It stays uncharged.
It stays uncharged.
It becomes positively charged.
It becomes positively charged.
It becomes negatively charged.
It becomes negatively charged.
A student is investigating what happens when a neutral metal sphere sitting on an insulated stand is touched by a negatively charged rod. The set up for the student's investigation is shown in the diagram.
image 3845826dd9f243109fa16213cd34e0d4
What will happen to the excess electrons when the negatively charged rod touches the metal sphere?
Responses
The excess electrons will move from the sphere to the rod and spread out along the rod.
The excess electrons will move from the sphere to the rod and spread out along the rod.
The excess electrons will move from the rod to the sphere and stay clustered in the area where the rod touches the sphere.
The excess electrons will move from the rod to the sphere and stay clustered in the area where the rod touches the sphere.
The excess electrons will move from the sphere to the rod and stay clustered near the end of the rod that touches the sphere.
The excess electrons will move from the sphere to the rod and stay clustered near the end of the rod that touches the sphere.
The excess electrons will move from the rod to the sphere and spread out on the sphere.
The excess electrons will move from the rod to the sphere and spread out on the sphere.
The excess electrons will move from the rod to the sphere and spread out on the sphere.
A student is designing an investigation of the distribution of charges in conductors. She will use two conducting spheres mounted on insulating stands in the investigation. The conducting spheres are shown.
image 20dd73ed8cf143748d14ec76f16d7970
The student wants to separate the charges of the spheres as shown.
image 6e01081a67464a9cb75abfdb169f19b8
What should the student do in her investigation to produce these results?
Responses
She should place a negatively charged rod near the left sphere.
She should place a negatively charged rod near the left sphere.
She should place a positively charged rod near the left sphere.
She should place a positively charged rod near the left sphere.
She should place two positively charged rods near each sphere.
She should place two positively charged rods near each sphere.
She should place two negatively charged rods near each sphere.
She should place a positively charged rod near the left sphere.
Seamus made an electromagnet from an iron nail, a piece of copper wire with three coils spread out across the nail, and a AAA-sized battery. His magnet attracts only one paper clip, and he wants to boost the power of his magnet to attract at least four paper clips. What two things can Seamus do to accomplish his goal?
Responses
Seamus can add batteries to increase the voltage, and he can decrease the space between the wire coils.
Seamus can add batteries to increase the voltage, and he can decrease the space between the wire coils.
Seamus can add batteries to decrease the voltage, and he can decrease the space between the wire coils.
Seamus can add batteries to decrease the voltage, and he can decrease the space between the wire coils.
Seamus can add batteries to decrease the voltage, and he can increase the space between the wire coils.
Seamus can add batteries to decrease the voltage, and he can increase the space between the wire coils.
Seamus can add batteries to increase the voltage, and he can increase the space between the wire coils.