Uniform but time-varying magnetic field  $B=\frac{B_{0}t}{T}$ is present in the cylindrical region. There is small section at corners (represented with solid black rectangles) which is made with insulating material (insulating the sides of the rectangle from one another) and other portion of rectangular loop is conducting. Loop is moving with constant velocity v. At $t=T$ , situation is as shown in figure. C is centre of cylindrical region. Choose correct option/s at the given instant.

Due to changing magnetic field, an induced electric field is set up.

Since magnitude of inward magnetic field is increasing, induced electric field is anticlockwise.

Along PQ, angle between $\overrightarrow{E}\&\overrightarrow{dl}$ is acute. Hence, $e={\int }_P^Q\overline{E}·\overline{dl}\ne 0$. Alternatively, force on electrons is downwards towards Q.

Option (a) is wrong. Option (d) is wrong.

Along BP, angle between $\overrightarrow{E}\&\overrightarrow{dl}$ is obtuse. So, induced emf is negative. It means from B to P, potential decreases.   

Alternatively, force on electrons is from B to P. Option (b) is correct.

Along AQ, angle between $\overrightarrow{E}\&\overrightarrow{dl}$ is acute. So, induced emf is positive. It means from A to Q, potential increases.   

Alternatively, force on electrons is from Q to A. Option (c) is wrong.