A rectangular metallic loop is moving out of a uniform magnetic field region to a field free region with a constant speed. When the loop is partially inside the magnate field, the plot of magnitude of induced emf $(\varepsilon)$ with time $(t)$ is given by

• A

  
  
• B

  
  
• C

  
  
• Correct answer
  D

  
  

Solution

$\begin{aligned} & E=-\frac{d \phi}{d t} \\ & \phi=B b x \\ & |E|=B b v\end{aligned}$

Hence, the correct answer is option: 'D'.