A conducting circular ring moves with constant velocity through a finite region of uniform magnetic field, as shown in the original question figure. Which induced-emf-versus-time graph is correct?

Options

• Option A

  Positive curved pulse while entering, zero when fully inside, then negative curved pulse while leaving

  
• Option B

  Positive triangular pulse, zero, then negative triangular pulse

  
• Option C

  A continuous cosine-like curve alternating from positive to negative

  
• Option D

  Two V-shaped pulses of opposite sign