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The adjoining figure shows two different arrangements in which two square wire frames are placed in a uniform constantly decreasing magnetic field $B.$ The value of magnetic flux in each case is given by

• A
  Case $I: \Phi = \pi (L^2 + l^2)B;$ Case $II: \Phi = \pi (L^2 -  l^2)B$
• B
  Case $I: \Phi = \pi (L^2 + l^2)B;$ Case $II: \Phi = \pi (L^2 +  l^2)B$
• ✓
  Case $I: \Phi = (L^2 + l^2)B;$ Case $II: \Phi = (L^2 -  l^2)B$
• D
  Case $I: \Phi =  (L+ l)^2B;$ Case $II: \Phi = \pi (L+  l)^2B$