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Assertion : A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It will stay in any direction.
Reason : At geomagnetic pole BH = 0 (1).

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Important Questions on Matter and Magnetism

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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Assertion & Reason)>Q 102
Assertion : MnO2 is ferromagnetic.
Reason : Domains are equally aligned in parallel and anti parallel direction
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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Assertion & Reason)>Q 103
Assertion : Magnetic susceptibility of diamagnetic substance is small negative. 
Reason : Diamagnetic substance have unpaired electron
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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Assertion & Reason)>Q 104
Assertion : Super conductors' can be easily levitated in strong magnetic field. 
Reason : Magnetic susceptibility of superconductor is extremely positive. 
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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Assertion & Reason)>Q 105
If a bar magnet is dropped vertically into a, long copper tube then its final acceleration will be:- 
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Beta Question Bank for Medical: Physics>Chapter 26 - Matter and Magnetism>Exercise (Assertion & Reason)>Q 106
Assertion :- If a steel core is used in a transformer in place of soft iron core then hysteresis losses are increased
Reason : Steel core is easily magnetised but it is not easily demagnetised by the alternating magnetic field.