Question

 1)  Parts A-E refer to the following figure of a circular loop of conducting wire. In the figure, Region I has a uniform magnetic field in the direction shown and Region II has no magnetic field.

 a) If the loop moves to the right and starts to move into Region II, what is the direction of the induced current in the wire? Circle the correct response.

 a) Clockwise.

 b) Counterclockwise.

 c) There is no induced current.

 b) If the loop moves straight down and remains completely in Region I, what is the direction of the induced current in the wire? Circle the correct response.

 a) Clockwise.

 b) Counterclockwise.

 c) There is no induced current.

 c) If the loop's diameter increases while the loop remains completely in Region I, what is the direction of the induced current in the wire? Circle the correct response.

 a) Clockwise.

 b) Counterclockwise.

 c) There is no induced current.

 d) If the loop remains completely in Region I and the magnitude of the magnetic field decreases,what is the direction of the induced magnetic field? Circle the correct response.

 a) Clockwise.

 b) Counterclockwise.

 c) There is no induced current.

 e) If the loop remains completely in Region I and starts to rotate such that the bottom of the loop comes out of the plane of the page and the top of the loop goes into the plane of the page, what is the direction of the induced current in the wire? Circle the correct response.

 a) Clockwise.

 b) Counterclockwise.

 c) There is no induced current. 

Answer 1

Whenever there is a change in Magnetic flux through an area, then there is an induced current in such a way that it opposes the cause that induced the Current.

Eg. If the increasing Magnetic field is the cause, the direction of Current is such that it decreases the field and vice-versa.

A. If the loop comes out of Region 1 , then decreasing Magnetic field is the cause and to oppose it, the Current will flow Clockwise

B. When it moves straight down, then the flux doesn't change because of constant Magnetic field. Hence Ans is C. No induced Current

C . If the diameter increases , then the area grows hence the Magnetic field increases and hence the Current starts to flow in Counter clockwise Direction.

D. If the Magnetic field decreases, then the Current will flow in such a way that it will increase the filed in Inward direction.

Hence Answer is Clockwise

E. By doing so, the inward Magnetic field is decreasing, hence the Current induced will flow in Clockwise direction.