Question

A bar magnet of magnetic moment lies aligned with the direction of a uniform magnetic field of 0.22 T. 
(a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction, (ii) opposite to the field direction? 
(b) What is the torque on the magnet in cases (i) and (ii)?

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Updated on : 2022-09-05
Solution
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Here
(a) 

  (i)
    (along the field)
    (perpendicular to the field)
   
  (ii) 
   
   

(b)
Torque  
  (i) 
   
   
  (ii) 
   
   

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