Physics-
General
Easy

Question

A wire P Q R is bent as shown in figure and is placed in a region of uniform magnetic field B. The length of P Q equals Q R equals l. A current I ampere flows through the wire as shown. The magnitude of the force on P Q blank a n d blank Q R will be

  1. B I l comma blank 0    
  2. 2 B I l comma blank 0    
  3. 0 comma blank B I l    
  4. 0 comma blank 0    

The correct answer is: 0 comma blank B I l


    The Lorentz force acting on the current carrying conductor in the magnetic field is
    F equals I B l sin invisible function application theta
    Since, wire P Q is parallel to the direction of magnetic field, then theta equals 0 comma
    therefore F subscript P Q end subscript equals I B l sin invisible function application 0 degree equals 0
    Also, wire Q R is perpendicular to the direction of magnetic field, then theta equals 90 degree.
    therefore F subscript Q R end subscript equals I B l sin invisible function application 90 degree equals I B l

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