A) OC
B) OD
C) OA
D) OB
Correct Answer: A
Solution :
Magnetisation \[(I)=\] magnetic moment per unit volume of a magnetized substance. \[\vec{H}=\frac{{\vec{\beta }}}{{{\mu }_{0}}}-\vec{I}\] \[=I{{\chi }_{m}}H\] Magnetic susceptibility of diamagnetic substance is negative. \[I=-H\] \[OC'=\text{retentivity}\] \[OC''=\text{coercivity}\] \[{{\mu }_{r}}=\text{slightly}\,\text{less}\,\text{than}\,\text{one}\] \[=1+{{\chi }_{m}}\] \[{{\chi }_{m}}=-\upsilon e\]also less than one \[\tan \theta =\frac{I}{H}={{\chi }_{m}}\] \[\theta <45\]if \[\theta =45\] \[{{\chi }_{m}}=-1\] \[{{\mu }_{r}}=0\]not possible If \[\theta >45\,{{\chi }_{m}}>-1\,{{\mu }_{r}}=-\upsilon e\]not possible Hence, \[OC\]is correct.You need to login to perform this action.
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