Time Varying Magnetic Field MCQ - Practice Questions with Answers

The figure shows three regions of the magnetic field, each of area A, and in each region magnitude of the magnetic field decreases at a constant rate a. If  $\overrightarrow{E}$ is an induced electric field then the value of the line integral $\oint \overrightarrow{E}\cdot d\overrightarrow{r}$ Along the given loop is equal to:

A small circular loop of wire of radius a is located at the center of a much larger circular wire loop of radius b.  The two loops are in the same plane. The outer loop of radius b carries an alternating current I=I_o cos (ωt).  The emf induced in the smaller inner loop is nearly :

In the figure shown a square loop PQRS of side 'a' and resistance 'r' is placed near an infinitely long wire carrying a constant current I. The sides PQ and RS are parallel to the wire. The wire and the loop are in the same plane. The loop is rotated by 180º about an axis parallel to the long wire and passing through the midpoints of the side QR and PS. The total amount of charge which passes through any point of the loop during rotation is  :