A negatively charged balloon sticks to a wooden door. However, an uncharged balloon does not stick to a wooden

Question

door. What is the nature of the charge on the wooden door?

A. Electrically charged

B. Positively charged

C. Conductor

D. Lacking protons

When two bodies are charged, the total charge before and after charging remains the same because of:

A. quantization of charges

B. conservation of charges

C. law of induction

D. Coulomb's law

When a conducting sphere is charged positively, intially the charge is deposited on the left side. However, due to the sphere's conducting nature, the charge spreads uniformly throughout the surface to the sphere. Charge is uniformly distributed because:

A. charged atoms at the location of charge distribute throughout the surface.

B. excess protons move from the location of charge to rest.

C. excess protons within the sphere move toward excess protons.

D. excess charge within the sphere moves out into the ground from the surface.

Answer 1

1.positively charged.

2.conservation of charge

3.excess protons move from the location of charge to rest.

Answer 2

Some of these answers seem a little poorly worded but oh well.

The door should be B. Positively charged. The balloon must have a force acting on it in order to overcome gravity. The force in this case is an electrostatic force and must have an opposite charge of the balloon or else it will be repelled. Technically A is correct but is a little vague. C would not provide an attractive force but it would cause the electrons in the door to move away from the balloon. D is the same as a negatively charged door.

The charge remains the same because of B. Conservation of charges

None of the other answers make sense. It's kind of the same idea as Conservation of energy. You can't create electrons or protons unless you go back to the start of the universe.

Charge is distributed because A. Charged atoms at the location of charge distribute throughout the surface.

A conductor allows charges to move and like charges repel so they try to get away from each other.