• Assertion (A): The deflecting torque acting on a current-carrying loop is zero when its plane is perpendicular to the direction of the magnetic field. • Reason (R): The deflecting torque acting on a loop of the magnetic moment vecm in a magnetic field vecB is given by the dot product of vecm and vecB.

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KollegeApply · Accepted Answer

Assertion (A) is true and Reason (R) is false. Explanation: The deflecting torque acting on a current-carrying loop placed in a magnetic field is given by the equation: vectau = vecm xx vecB Where τ is the deflecting torque, m is the magnetic moment of the loop, and B is the magnetic field. The symbol "x" denotes the vector product. When the plane of the loop is perpendicular to the direction of the magnetic field, the angle between the magnetic moment vector and the magnetic field vector is $90^\circ$. Both the deflecting torque and the vector product of the two vectors attain their maximum levels in this condition. However, the dot product of the two vectors is zero.

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