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in Physics by (54.6k points)

Which of the following statement is (are) correct in the given Fig. 21.143? 

(a) Net force on the loop is zero. 

(b) Net torque on the loop is zero. 

(c) Loop will rotate clockwise about axis OO' when seen from O 

(d) Loop will rotate anticlockwise about OO’ when seen from O 

1 Answer

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Best answer

Vector FBA = 0, because magnetic lines are parallel to this wire.

Vector  FCD = 0, because magnetic lines are antiparallel to this wire.

Vector  FCD is perpendicular to paper outwards and

Vector FAD is perpendicular to paper inwards. These two forces (although calculated by integration) cancel each other but produce a torque which tend to rotate the loop in clockwise direction about an axis OO’.

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