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(b)
  ​Figure shows a rectangular conducting loop PQRS in which arm RS of length 'l' is movable. The loop is kept in a uniform magnetic  field 'B' directed downward perpendicular to the plane of the loop. The arm RS is moved with a uniform speed v.

Deduce an expression for

(i)  ​The emf induced across the arm 'RS'
(ii)  ​The external force required to move the arm, and
(iii)  ​The power required to push RS.
 

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