Question

Ground your electroscope. Touch a negatively charged rod to the metal plate of the electroscope. Draw in the schematic how the charges are distributed, and indicate the new deflection of the rotating pointer once it has come to equilibrium + Perform this experiment with the charge remaining from step 3. Recharge your negatively charged object and bring it into close proximity to the metal plate without touching. We are charging by induction in this case. How does the rotating pointer react? Does it move towards the stem or away from the stem? Explain. Draw in the charge configuration for this situation in the dia gram to the right. Be sure to include the charged object and its relative location to the electroscope. 5. How can you tell that a greater magnitude of charge has been placed on the electroscope 6. Charge your electroscope with a negative charge. Take an inflated balloon and aggres sively rub it in your hair. Bring the balloon near the electroscope and pay attention to the deflection. Is the balloon positively or negatively charged: Explain negative 7. With the electroscope still negatively charged, bring the hair that rubbed the balloon into close proximity with the electroscope. Note the deflection of the needle. Is the hair positively or negatively charged? Explain. positive

just 5-7

Answer 1

5. we can say greater charge is placed on electroscope leaves if deflection due to repulsion of charges on leaves is higher.

6. Electroscope is already charged negative.If we bring balloon near electroscope without touching, we observe that the deflection increases. So we can conclude that ballon was negatively charged and hence positive charge is induced on head of electroscope and negative charge on leaves increases.

7. When the hair is brought nearby , the deflection decreases, because + charge generated on foil decreases negative charge. This means head is charged negative due to induced charge.Hence hair is positively charged.