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question_answer1) Assertion : We cannot think of magnetic field configuration with three poles. Reason : A bar magnet does exert a torque on itself due to its own field. [AIIMS 2002]
question_answer2) Assertion : The poles of magnet cannot be separated by breaking into two pieces. Reason : The magnetic moment will be reduced to half when a magnet is broken into two equal pieces. [SCRA 1994]
question_answer3) Assertion : Basic difference between an electric line and magnetic line of force is that former is discontinuous and the latter is continuous or endless. Reason : No electric lines of forces exist inside a charged body but magnetic lines do exist inside a magnet.
question_answer4) Assertion : Magnetic moment of an atom is due to both, the orbital motion and spin motion of every electron. Reason : A charged particle produces a magnetic field.
question_answer5) Assertion : When radius of circular loop carrying current is doubled, its magnetic moment becomes four times. Reason : Magnetic moment depends on area of the loop.
question_answer6) Assertion : The earth?s magnetic field is due to iron present in its core. Reason : At a high temperature magnet losses its magnetic property or magnetism.
question_answer7) Assertion : A compass needle when placed on the magnetic north pole of the earth rotates in vertical direction. Reason : The earth has only horizontal component of its magnetic field at the north poles.
question_answer8) Assertion : The tangent galvanometer can be made more sensitive by increasing the number of turns of its coil. Reason : Current through galvanometer is proportional to the number of turns of coil.
question_answer9) Assertion : The ferromagnetic substance do not obey Curie?s law. Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
question_answer10) Assertion : The properties of paramagnetic and ferromagnetic substance are not effected by heating. Reason : As temperature rises, the alignment of molecular magnets gradually decreases.
question_answer11) Assertion : Soft iron is used as transformer core. Reason : Soft iron has narrow hysteresis loop.
question_answer12) Assertion : Magnetism is relativistic. Reason : When we move along with the charge so that there is no motion relative to us, we find no magnetic field associated with the charge.
question_answer13) Assertion : The earth?s magnetic field does not affect the working of a moving coil galvanometer. Reason : Earth?s magnetic field is very weak.
question_answer14) Assertion : A paramagnetic sample display greater magnetisation (for the same magnetising field) when cooled. Reason : The magnetisation does not depend on temperature.
question_answer15) Assertion : Electromagnets are made of soft iron. Reason : Coercivity of soft iron is small.
question_answer16) Assertion : To protect any instrument from external magnetic field, it is put inside an iron body. Reason : Iron is a magnetic substance.
question_answer17) Assertion : When a magnet is brought near iron nails, only translatory force act on it. Reason : The field due to a magnet is generally uniform.
question_answer18) Assertion : When a magnetic dipole is placed in a non uniform magnetic field, only a torque acts on the dipole. Reason : Force would also acts on dipole if magnetic field were uniform.
question_answer19) Assertion : Reduction factor (K) of a tangent galvanometer helps in reducing deflection to current. Reason : Reduction factor increases with increase of current.
question_answer20) Assertion : The susceptibility of diamagnetic materials does not depend upon temperature. Reason : Every atom of a diamagnetic material is not a complete magnet in itself.
question_answer21) Assertion : The permeability of a ferromagnetic material is independent of the magnetic field. Reason : Permeability of a material is a constant quantity.
question_answer22) Assertion : For a perfectly diamagnetic substance permeability is always one. Reason : The ability of a material of permit the passage of magnetic lines of force through it is called magnetic permeability.
question_answer23) Assertion : Gauss theorem is not applicable in magnetism. Reason : Mono magnetic pole does not exist.
question_answer24) Assertion : Magnetic moment of helium atom is zero. Reason : All the electron are paired in helium atom orbitals.
question_answer25) Assertion : For making permanent magnets, steel is preferred over soft iron. Reason : As retentivity of steel is smaller.
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