Q1. [1] medium exam-ready
Assertion (A): The magnetic field lines of a bar magnet are closed curves.
Reason (R): Outside the magnet, field lines go from north to south pole, and inside the magnet they continue from south to north pole, forming a complete closed loop.
(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
(C) Assertion (A) is true, but Reason (R) is false.
(D) Assertion (A) is false, but Reason (R) is true.
- A Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- B Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).
- C Assertion (A) is true, but Reason (R) is false.
- D Assertion (A) is false, but Reason (R) is true.
Generated by claude-sonnet-4-6 · 2026-06-26 01:10 · grounding rag
Model Answer
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
Explanation
The textbook states: "Outside the magnet, field lines emerge from the north pole and merge at the south pole; inside the magnet, they go from south to north — thus magnetic field lines are closed curves." The Reason correctly and completely explains why the Assertion is true.