Physics-
General
Easy

Question

A coil P Q R S carrying a current i ampere is placed in a powerful horse shoe magnet N S of uniform magnetic field stack B with rightwards arrow on top figure. If A is the area of the coil and theta is the inclination of the plane of the coil with the magnetic field in equilibrium, then the deflecting couple will be

  1. B i A cot invisible function application theta    
  2. B i A cos invisible function application theta    
  3. B i A cosec invisible function application theta    
  4. B i A sin invisible function application theta    

The correct answer is: B i A cos invisible function application theta


    Deflecting couple = torque on the loop = B i A cos invisible function application theta.

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