Assertion (A): The magnetic field configuration with 3 poles is not possible.
Reason (R): No torque acts on a bar magnet itself due to its own field.

Options

A. Both A and Rare Tuę and R is the correct explanation of A
B. Both A and R are true but R is NOT the correct explanation of A
C. A is true but R is false
D. A is false and R is true

Explanation

To analyze the assertion and reason provided in the question, we will go through the following steps:

### Step 1: Understand the Assertion
The assertion states that a magnetic field configuration with three poles is not possible. A bar magnet has two poles: a North Pole and a South Pole. When a magnet is cut, each piece will always have one North Pole and one South Pole. Therefore, it is impossible to create a magnet with three distinct poles.

### Step 2: Validate the Assertion
To validate the assertion, we can consider the nature of magnetic poles. Magnetic monopoles (isolated North or South poles) have not been observed in nature. When we attempt to create a third pole by any means, such as cutting a magnet, the result will always yield two poles. Thus, the assertion is correct.

### Step 3: Understand the Reason
The reason states that no torque acts on a bar magnet itself due to its own field. Torque (τ) on a magnetic dipole in a magnetic field (B) is given by the equation:
\[ \tau = \vec{m} \times \vec{B} \]
where \(\vec{m}\) is the magnetic moment of the magnet. If the magnetic moment is aligned with the magnetic field, the angle between them is zero, and thus the torque becomes zero.

### Step 4: Validate the Reason
The reason is also valid. A bar magnet does not experience torque due to its own magnetic field because the magnetic field produced by the magnet does not exert a force on itself. Therefore, the torque acting on the magnet due to its own field is indeed zero.

### Step 5: Conclusion
Both the assertion and the reason are correct. However, the reason does not directly explain the assertion. The assertion is about the impossibility of a three-pole configuration, while the reason discusses torque acting on the magnet. Therefore, while both statements are true, the reason does not support the assertion adequately.

### Final Answer
- Assertion (A) is correct: A magnetic field configuration with three poles is not possible.
- Reason (R) is correct: No torque acts on a bar magnet itself due to its own field.
- However, R does not explain A.