Magnetic Flux - Practice Questions & MCQ

A square loop of side 4 cm is lying on a horizontal table. A uniform magnetic field of 0.5 T is directed towards at an angle of 60° to the vertical as shown in figure. If the field
increases from zero to its final value in 0.2s, the e.m.f. induced in the loop will be 
                              

A small loop of the area of the cross section  is lying concentrically and coplanar inside a bigger loop of radius 0.628 m. A current of 10 A is passed in the bigger loop. The smaller loop is rotated about its diameter with an angular velocity . The magnetic flux linked with the small loop will be :

A series combination of an inductance (L) and a resistance (R) is connected to a battery of emf E. The final value of current depends on

Two concentric coplanar circular loops 1 and 2 are shown in the Fig 19. The radii of the loops are r and R. Current I flows in the loop
1. Find the magnetic flux through the loop 2 if r << R

Two coils A and B are separated by a certain distance. If a current of 4 A flows through A, a magnetic flux of  Wb passes through B (no current through B). If no current passes through A and a current of 2A passes through B, then the flux through A is:

The magnetic flux linked with a coil of N turns of area of cross-section A held with its plane parallel to the field B is:

A circular disc of radius 0.2 m is placed in a uniform magnetic field of induction  in such a way that its axis makes an angle of 60° with B. The magnetic flux linked with the disc is:

A uniform but time varying magnetic field is present in a circular region of radius R. The magnetic field is perpendicular and into the plane of the loop and the magnitude of field is increasing at a constant rate  . There is a straight conducting rod of length 2R placed as shown in figure. The magnitude of induced emf across the rod is: