a girl touches a Van de graff generator and slowly moves away from the dome why when moving back to touch it again she recives a strong shock why ?
She probably discharged into the air, and through the floor.
THE oBJECT IS PULLED BY A FORCE PARALLEL TO THE SURFACE THER IS NO FIRCTION
When a girl touches a Van de Graaff generator and slowly moves away from the dome, she accumulates an extra amount of electric charge due to the generator's capability to transfer electrons to her body. This charge builds up on her body during the separation process. However, when she tries to touch the generator again, she receives a strong shock. Here's why:
1. Initial contact: When the girl touches the Van de Graaff generator initially, electrons are transferred from the dome to her body. This causes her body to become negatively charged, while the generator remains positively charged.
2. Separation: As she moves away from the dome, electrons from her body move along with her, resulting in an excess of electrons on her body. This accumulated charge is known as static electricity.
3. Electric potential difference: When she tries to touch the generator again, there is now a higher electric potential difference (voltage) between the negatively charged girl and the positively charged dome. The higher the voltage difference, the stronger the shock she experiences.
4. Spark discharge: When the girl gets close enough to the dome, the electric potential difference reaches a critical point where the charge tries to equalize. This leads to a sudden discharge of electrons, creating a visible spark and generating a strong shock.
In summary, the girl receives a strong shock when moving back to touch the Van de Graaff generator because of the electric potential difference generated by her accumulation of static electricity and the opposing charge on the dome.