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MOVING CHARGES AND MAGNETISM

Physics
Inter Second Year
English
Very Short Answer Questions
Q1. A current carrying circular loop lies on a smooth horizontal plane. Can a uniform magnetic field be set up insuch a manner that the loop turns about the vertical axis.

Answer

Ans. No, A uniform magnetic field cannot be set up in such a manner that the loop turns about the vertical axis.The torque acting on the loop is given by 
  $$  \vec{\tau}= \vec{M} \times\vec{B}= i\left(\vec{A}\times \vec{B} \right)$$
Since the area vector is along the vertical, the torque on the loop becomes zero.