1. Electric monopoles doesnt exist wheras magnetic monopoles exist
2. magnetic lines of solenoid at its ends and outside are not perfectly straight
3. magnetic field lines of toroid are confined in it
4. magnetic lines are not parallel inside bar magnet
5. perfect diamagnetic `to` `chi = -1`
which of the following statements are correct?

Options

A. 1,2
B. 1,3,5
C. 2,3,5
D. 2 only

Answer

To determine which statements are correct regarding electric and magnetic fields, let's analyze each statement step by step.

### Step 1: Analyze Statement 1
**Statement**: Electric monopoles don't exist whereas magnetic monopoles exist.

**Analysis**:
- Electric monopoles (positive or negative charges) do exist. A single charge can exist independently (e.g., a positive charge).
- Magnetic monopoles, on the other hand, have not been observed in nature. Every magnet has both a north and a south pole; if you cut a magnet, you will still have both poles.

**Conclusion**: This statement is **incorrect**.

### Step 2: Analyze Statement 2
**Statement**: Magnetic lines of solenoid at its ends and outside are not perfectly straight.

**Analysis**:
- Inside a solenoid, the magnetic field lines are approximately parallel and straight. However, at the ends of the solenoid and outside it, the magnetic field lines curve and are not straight.

**Conclusion**: This statement is **correct**.

### Step 3: Analyze Statement 3
**Statement**: Magnetic field lines of a toroid are confined in it.

**Analysis**:
- A toroid is a circular coil of wire. The magnetic field lines are indeed confined within the toroidal structure. Outside the toroid, the magnetic field is negligible or zero.

**Conclusion**: This statement is **correct**.

### Step 4: Analyze Statement 4
**Statement**: Magnetic lines are not parallel inside a bar magnet.

**Analysis**:
- Inside a bar magnet, the magnetic field lines are parallel and directed from the south pole to the north pole. They are uniform in strength and direction in the central region of the magnet.

**Conclusion**: This statement is **incorrect**.

### Step 5: Analyze Statement 5
**Statement**: Perfect diamagnetic susceptibility, χ = -1.

**Analysis**:
- For a perfect diamagnet, the magnetic susceptibility (χ) is indeed equal to -1. This means that it completely expels magnetic fields.

**Conclusion**: This statement is **correct**.

### Final Summary of Statements
- **Statement 1**: Incorrect
- **Statement 2**: Correct
- **Statement 3**: Correct
- **Statement 4**: Incorrect
- **Statement 5**: Correct

### Correct Statements
Thus, the correct statements are **2, 3, and 5**.

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