Physics-
General
Easy

Question

A uniform magnetic field of 1.5 T exists in a cylindrical region of radius 10.0 cm, its direction being parallel to the axis along east to west. A current carrying wire in north south direction passes through this region. The wire intersects the axis and experience a force of 1.2 N downward. (As shown in figure). If the wire is turned from North South to north east–southwest direction, then magnitude and direction of force is

  1. 1.2 N, upward    
  2. 1.2 square root of 2 text  downward end text    
  3. 1.2 N, downward    
  4. fraction numerator 1.2 over denominator square root of 2 end fraction N comma text  downward end text    

The correct answer is: 1.2 N, downward




    Initially
    1.2 N equals I. open parentheses stack l with rightwards arrow on top cross times stack B with rightwards arrow on top close parentheses downwards arrow
    In the given condition –
    F equals I fraction numerator l over denominator sin invisible function application theta end fraction B s i n invisible function application theta equals 1 l B equals 1.2 N downwards arrow

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