if the magnetic dipole moment of an atom of paramagnetic and ferromagnetic material is denoted by a and b then,
A=0, b not equal to zero
A=0, b=0
Both non zero
B =0,. A not zero

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Solution

$D e a r S t u d e n t, P a r a m a g n e t i c s u b s \tan c e s h a v e a p e r m a n e n t m a g n e t i c d i p o l e m o m e n t d u e t o e x c e s s o f e l e c t r o n s s p i n n i n g i n s a m e d i r e c t i o n . H e n c e a \neq 0 T h e m a g n e t i c d i p o l e m o m e n t o f a f e r r o m a g n e t i c m a t e r i a l i s a l w a y s n o n z e r o . H e n c e b \neq 0 A n s : O p t i o n C) B o t h n o n z e r o A l s o m a g n e t i c d i p o l e m o m e n t o f a d i a m a g n e t i c s u b s \tan c e i s z e r o . R e g a r d s .$

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