| Directions (Q. Nos.1 - 8): In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. |
| 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. |
A) Both A and R are true 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
Correct Answer: B
Solution :
| Option [b] is correct. |
| Explanation: Magnetic poles exist in pairs. So assertion is true. |
| The bar magnet does not exert a torque on itself in its own magnetic field. Torque is proportional to cross product of \[\overset{\to }{\mathop{\operatorname{M}}}\,\] and \[\overset{\to }{\mathop{\operatorname{B}}}\,\]. The angle between \[\overset{\to }{\mathop{\operatorname{M}}}\,\] and \[\overset{\to }{\mathop{\operatorname{B}}}\,\] being 0, the cross product is 0. So, there will be no torque. |
| So reason is also true. |
| But R cannot explain A. |
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