Physics-
General
Easy

Question

The figure shows four wire loops, with edge lengths of either L or 2L. All four loops will move through a region of uniform magnetic field stack B with rightwards arrow on top (directed out of the page) at the same constant velocity. Rank the four loops according to the maximum magnitude of the e.m.f. induced as they move through the field, greatest first

  1. left parenthesis e subscript c end subscript equals e subscript d end subscript right parenthesis less than left parenthesis e subscript a end subscript equals e subscript b end subscript right parenthesis    
  2. left parenthesis e subscript c end subscript equals e subscript d end subscript right parenthesis greater than left parenthesis e subscript a end subscript equals e subscript b end subscript right parenthesis    
  3. e subscript c end subscript greater than e subscript d end subscript greater than e subscript b end subscript greater than e subscript a end subscript    
  4. e subscript c end subscript less than e subscript d end subscript less than e subscript b end subscript less than e subscript a end subscript    

The correct answer is: left parenthesis e subscript c end subscript equals e subscript d end subscript right parenthesis greater than left parenthesis e subscript a end subscript equals e subscript b end subscript right parenthesis


    Emf induces across the length of the wire which cuts the magnetic field. (Length of c = Length d) > (Length of a = b). So left parenthesis e subscript c end subscript equals e subscript d end subscript right parenthesis > left parenthesis e subscript a end subscript equals e subscript b end subscript right parenthesis

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