Why do the two leaves present in an electro scope always move apart when a charged body is brought near the brass rod connected to them?

Options

A. Because both develop like charges
B. Because both develop unlike charges
C. Because both develop different polarity
D. Because both develop negative charge

Answer

To understand why the two leaves in an electroscope move apart when a charged body is brought near the brass rod, we can break down the explanation into several steps:

### Step-by-Step Solution:

1. **Understanding the Electroscope**: An electroscope is a device used to detect electric charge. It consists of a metal rod connected to two thin metal leaves (often made of gold or aluminum) that hang down inside a glass container.

2. **Initial State**: Initially, when the electroscope is uncharged, the leaves hang straight down and are not repelling each other because they have no charge.

3. **Bringing a Charged Body Near**: When a charged body (either positively or negatively charged) is brought close to the brass rod of the electroscope, it influences the charges within the electroscope.

4. **Induction Process**: The charged body induces a separation of charges in the electroscope. If the charged body is positively charged, it attracts electrons from the leaves and the rod, causing the leaves to become positively charged. If the charged body is negatively charged, it repels electrons, causing the leaves to become negatively charged.

5. **Charge Distribution**: As a result of this induction, both leaves acquire the same type of charge (either both positive or both negative). Since like charges repel each other, the leaves will start to move apart.

6. **Movement of Leaves**: The movement of the leaves apart is a direct result of the repulsion between the like charges on both leaves. The more charge they acquire, the further apart they move.

7. **Conclusion**: Therefore, the two leaves in the electroscope always move apart when a charged body is brought near the brass rod because they both acquire the same charge due to the induction process, leading to repulsion.