Faradays Law Lenz Law

A conducting circular loop is placed in a uniform magnetic field of T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at a rate of mm/s. The induced emf in the loop when the radius is cm is:
1.

2.

3.

4.

A conducting circular loop is placed in a uniform magnetic field, with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of . The induced emf, when the radius is , is:
1.
2.
3.
4.

The current in a coil varies with time as shown in the figure. The variation of induced emf with time would be:

1.		2.
3.		4.

A coil of resistance is placed in a magnetic field. The magnetic flux linked with the coil varies with time as The current in the coil at is:$$

1.		2.
3.		4.

An electron moves on a straight-line path as shown. The is a coil adjacent to the path of electrons. What will be the direction of current if any, induced in the coil? 

1.
2.
3.	The current will reverse its direction as the electron goes past the coil
4.	No current included

A uniform magnetic field is restricted within a region of radius . The magnetic field changes with time at a  rate . Loop of radius is enclosed within the region and loop of radius is outside the region of the magnetic field as shown in the figure. Then, the emf generated is:

1.	zero in loop and zero in loop
2.	in loop and zero in loop
3.	in loop and zero in loop
4.	zero in loop and not defined in loop

A long solenoid of diameter m has turns per meter. At the center of the solenoid, a coil of turns and radius m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to A from A in s. If the resistance of the coil is , then the total charge flowing through the coil during this time is:
1.
2.
3.
4.

A turn coil of effective area is kept perpendicular to a magnetic field . When the plane of the coil is rotated by $$around any of its coplanar axis in , the emf induced in the coil will be:

1.		2.
3.		4.

The magnetic flux linked with a coil (in Wb) is given by the equation . The magnitude of induced emf in the coil at s will be:

1.	V	2.	V
3.	V	4.	V

A big circular coil with turns and an average radius of is rotating about its horizontal diameter at a rate of The vertical component of the Earth's magnetic field at that location is and the electrical resistance of the coil is the maximum induced current in the coil will be:

1.		2.
3.		4.

In the above diagram, a strong bar magnet is moving towards solenoid- from solenoid- . The direction of induced current in solenoid- and that in solenoid- , respectively, are through the directions:

1.   and
2.   and
3.   and
4.   and