question_answer

A bar magnet when placed at an angle of 30° to the direction of magnetic field induction of \[5\times {{10}^{2}}T\]experiences a moment of couple \[25\times {{10}^{-6}}Nm.\] If the length of the magnet is 5 cm, its pole strength is:

A) \[2\times {{10}^{-6}}A-m\]                         

B)  \[5\times {{10}^{2}}A-m\]

C) \[2\text{ }A-m\]                                

D)  \[5\text{ }A-m\]