What type of charge is accumulated on the rubber when glass is rubbed with rubber?

Options

A. Negative
B. Positive
C. Unchanged
D. None of the above

Explanation

To determine the type of charge that accumulates on rubber when it is rubbed with glass, we can follow these steps:

### Step 1: Understand the Materials
- Identify the two materials involved: rubber and glass.
- Recognize that both materials have different affinities for electrons.

**Hint:** Consider the properties of rubber and glass in terms of electron affinity.

### Step 2: Friction and Charge Transfer
- When rubber is rubbed against glass, friction generates heat.
- This heat affects the electrons in both materials.

**Hint:** Think about how heat can influence the movement of electrons in materials.

### Step 3: Electron Movement
- The electrons in glass are more loosely bound compared to those in rubber.
- As a result, when rubbed, some electrons from the glass can transfer to the rubber.

**Hint:** Remember that the material with loosely bound electrons tends to lose them when in contact with a material that holds electrons more tightly.

### Step 4: Resulting Charges
- After rubbing, the rubber gains extra electrons, which gives it a negative charge.
- Conversely, the glass rod loses some electrons, resulting in a positive charge due to a deficiency of electrons.

**Hint:** Consider the concept of charge conservation and how the loss of electrons from one material affects its charge.

### Step 5: Conclusion
- Therefore, the charge accumulated on the rubber after rubbing it with glass is negative.

**Final Answer:** The charge accumulated on the rubber is negative.