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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A cylindrical region of radius R is filled with a uniform magnetic field B as shown in the figure. A metal wire (AB) of length L is placed inside the field such that its ends are symmetrically located with respect to the centre (O) of the circular cross section of the region. If the magnetic field is changed at a rate dBdt the emf induced in the metal wire is e. Find change in value of ε if the wire is displaced by a small distance ΔL parallel to its own length.

A cylindrical region of radius R is filled with a uniform magnetic field B as shown in the figure. A metal wire (AB) of length L is placed inside the field such that its ends are symmetrically located with respect to the centre (O) of the circular cross section of the region. If the magnetic field is changed at a rate dBdt the emf induced in the metal wire is e. Find change in value of ε if the wire is displaced by a small distance ΔL parallel to its own length.

A line charge with linear charge density λ is wound around an insulating disc of mass M and radius R of radius a pointing up. Now the magnetic field is switched off so that it is free to rotate. In the central region there is a uniform magnetic field B0 which causes the disc to rotate. Find the angular speed with which the disc starts rotating. which is then suspended horizontally as shown in Fig. 3.90