Rub a glass rod vigorously with silk. Bring the tip of the electroscope with glass rod as shown in figure. What do you observe? Do the leaves separate farther if you rub harder? Why do the leaves collapse after the charged rod is pulled back without touching the electroscope?
Due to the rubbing, glass rod gets positive charge. When this positively charged glass rod is brought near the metal cap, free electrons of the copper wire are attracted towards the glass rod. Due to this attraction, electrons pile up at the near end and the further end (leaves) become positively charged. The positive charges at the leaves produce repulsion on it. If the glass rod is taken away, the electrons re-distribute and the electroscope becomes neutral. Hence the leaves collapse.
When a charged body is brought near a conductor, opposite charges are developed on it. This phenomenon is caled electro static induction.
Charging by Conduction
Touch a charged rod to the electroscope and remove it. What do you observe? Why?
When the charged body touches the electroscope, charge will flow to it and electroscope acquires charge similar to that of the charged body. Thus Charging a body with actual contact of another body is called charging by conduction.
Charging by Induction
Activity 2
Rub the glass rod vigorously with silk. Bring the glass rod near the top of electroscope as shown in figure. Then touch your finger on the top of the metal sphere.
What do you observe? Why don't the leaves collapse after the charged rod and finger are pulled back?
While touching the ball of the electroscope with finger, the negative charge of the rod will flow to the earth through your body. After removing the rod and the finger the leaves move apart, indicating that the electroscope is now positively charged due to loss of electrons.
Such a process in which permanent charge is imparted on a conductor by a combined action of electrostatic induction and earthing is called charging by induction.
Due to the rubbing, glass rod gets positive charge. When this positively charged glass rod is brought near the metal cap, free electrons of the copper wire are attracted towards the glass rod. Due to this attraction, electrons pile up at the near end and the further end (leaves) become positively charged. The positive charges at the leaves produce repulsion on it. If the glass rod is taken away, the electrons re-distribute and the electroscope becomes neutral. Hence the leaves collapse.
When a charged body is brought near a conductor, opposite charges are developed on it. This phenomenon is caled electro static induction.
Charging by Conduction
Touch a charged rod to the electroscope and remove it. What do you observe? Why?
When the charged body touches the electroscope, charge will flow to it and electroscope acquires charge similar to that of the charged body. Thus Charging a body with actual contact of another body is called charging by conduction.
Charging by Induction
Activity 2
Rub the glass rod vigorously with silk. Bring the glass rod near the top of electroscope as shown in figure. Then touch your finger on the top of the metal sphere.
What do you observe? Why don't the leaves collapse after the charged rod and finger are pulled back?
While touching the ball of the electroscope with finger, the negative charge of the rod will flow to the earth through your body. After removing the rod and the finger the leaves move apart, indicating that the electroscope is now positively charged due to loss of electrons.
Such a process in which permanent charge is imparted on a conductor by a combined action of electrostatic induction and earthing is called charging by induction.
No comments:
Post a Comment