A: A bar magnet does not exert a torque on itself due to its own field.
R: One element of a current-carrying non-straight wire exert a force on another element of the same wire.

Options

A. If both Assertion & Reason are the true and the reason is the correct explanation of the assertion, then mark (1)
B. If both Assertion & Reason are true but the reson is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3)
D. If both Assertion and Reason are false statements, then mark (4)

Answer

To analyze the given assertion and reason, let's break down the statements step by step.

### Step 1: Evaluate the Assertion
**Assertion:** A bar magnet does not exert a torque on itself due to its own field.

- A bar magnet has two poles: a North pole and a South pole. The magnetic field produced by the magnet interacts with the magnet itself.
- However, the forces acting on the different parts of the magnet due to its own magnetic field result in equal and opposite torques that cancel each other out.
- Therefore, the net torque acting on the bar magnet due to its own field is zero.

**Conclusion for Assertion:** The assertion is true.

### Step 2: Evaluate the Reason
**Reason:** One element of a current-carrying non-straight wire exerts a force on another element of the same wire.

- In a current-carrying wire, each segment of the wire generates a magnetic field around it.
- According to Ampère's law, a current-carrying conductor experiences a force due to the magnetic field created by other current-carrying segments.
- Thus, one segment (or element) of the wire does exert a force on another segment of the same wire.

**Conclusion for Reason:** The reason is also true.

### Step 3: Determine the Relationship Between Assertion and Reason
- Both the assertion and the reason are true statements.
- However, they pertain to different topics: the assertion is about the behavior of a bar magnet in its own field, while the reason discusses the interaction between elements of a current-carrying wire.

### Final Conclusion
- The assertion is true, and the reason is true, but the reason does not explain the assertion. Therefore, the correct option is that both statements are true, but the reason does not explain the assertion.

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