When a balloon is rubbed with a piece of wool which type of charge does it acquire? Is it -ve or +ve?
When a balloon is rubbed with a piece of wool, a piece of wool have lost electrons to the balloon and so have acquired a positive charge, while balloon acquired a negative charge.
A charged balloon repelled a charged balloon.
A charged plastic straw repelled a charged plastic straw.
But a charged balloon attracted a charged plastic straw.
It is a convention to call the charge acquired by a balloon when it is rubbed with a wool as positive. The other kind of charge is said to be negative.
It is observed that when a charged balloon is brought near a charged plastic straw rubbed with polythene there is attraction between the two.
What do you think would be the kind of charge on the plastic straw? Your guess, that the plastic straw would carry a negative charge is correct.
The electrical charges generated by rubbing are static. They do not move by themselves. When charges move, they constitute an electric current. The current in a circuit which makes a bulb glow, or the current that makes a wire hot, is nothing but a motion of charges.
A charged balloon repelled a charged balloon.
A charged plastic straw repelled a charged plastic straw.
But a charged balloon attracted a charged plastic straw.
It is a convention to call the charge acquired by a balloon when it is rubbed with a wool as positive. The other kind of charge is said to be negative.
It is observed that when a charged balloon is brought near a charged plastic straw rubbed with polythene there is attraction between the two.
What do you think would be the kind of charge on the plastic straw? Your guess, that the plastic straw would carry a negative charge is correct.
The electrical charges generated by rubbing are static. They do not move by themselves. When charges move, they constitute an electric current. The current in a circuit which makes a bulb glow, or the current that makes a wire hot, is nothing but a motion of charges.
