Which is an example of gaining a static charge by conduction?
A) Rubbing a balloon against your hair.
B) Shuffling your shoes across a carpet.
C) Bringing a charged rod near an electroscope.
D)Touching your car on a cold day and getting a shock.
The Correct Answer and Explanation is:
The correct answer is:
D) Touching your car on a cold day and getting a shock.
Explanation:
Gaining a static charge by conduction occurs when there is direct contact between two objects, allowing electric charge to transfer from one to the other. Conduction involves the movement of electrons through direct contact, and it can cause one object to gain a charge if electrons are transferred from a charged object to a neutral one. This process leads to both objects eventually having the same type of charge (either both positive or both negative), though one may have a stronger charge depending on the amount of electron transfer.
In the example given by option D, when you touch your car on a cold day, you may feel a shock due to static electricity. This shock occurs because you have accumulated a static charge, possibly from walking across a carpet or sitting in a car seat, which can lead to a buildup of static on your body. When you touch the metal of the car, the charge moves through direct contact, creating a spark as the electrons flow from your body to the car (or vice versa) to equalize the charge difference. This is a clear example of charging by conduction, as it involves direct contact and the transfer of electrons.
To understand why the other options do not illustrate conduction:
- Option A (Rubbing a balloon against your hair): This represents charging by friction, where electrons are transferred between the balloon and hair due to the rubbing motion, not by direct contact conduction.
- Option B (Shuffling your shoes across a carpet): Similarly, this is charging by friction, as electrons are transferred between your shoes and the carpet due to rubbing.
- Option C (Bringing a charged rod near an electroscope): This is charging by induction, where a nearby charge causes a redistribution of electrons within the electroscope without direct contact.
Therefore, option D is the correct example of charging by conduction.