A) OC
B) OD
C) OA
D) OB
Correct Answer: A
Solution :
Magnetisation (I) = magnetic moment per unit volume of a magnetized substance. \[\overset{\to }{\mathop{H}}\,=\frac{\overset{\to }{\mathop{\beta }}\,}{{{\mu }_{0}}}-\overset{\to }{\mathop{I}}\,\] \[=I{{\chi }_{m}}H\] Magnetic susceptibility of diamagnetic substance is negative. \[I=-H\] \[OC=\] retentivity \[OC=\]coercivity \[{{\mu }_{r}}=\] slightly less than 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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