Two long concentric cylindrical conductors of radii a and b `(b lt a)` are maintained at a potential difference V and carry equal opposite current I. Show that an electron with a particular velocity u parallel to the axis may travel undeviated in the evacuated region between the conductors.

Two long concetric cylindrical conductors of radii a and b (b lt a) are maintained at a potential difference V and carry equal and opposite currents l. Show that an electron with a particular velocity u parallel to the axis may travel underivated in the evacuated region between the conductors, and calculate u when a = 50 mm, b = 2.0 mm, V = 50 V and l = 100 A. It is also possible for the electron to travel in a helical path. By regarding such a path as the combination of a circular motion perpendicular to the axis with a steady velocity parallel to the axis, indicate without detailed mathematics how this comes about.

Two long concetric cylindrical conductors of radii a and b (b lt a) are maintained at a potential difference V and carry equal and opposite currents l. Show that an electron with a particular velocity u parallel to the axis may travel underivated in the evacuated region between the conductors, and calculate u when a = 50 mm, b = 2.0 mm, V = 50 V and l = 100 A. It is also possible for the electron to travel in a helical path. By regarding such a path as the combination of a circular motion perpendicular to the axis with a steady velocity parallel to the axis, indicate without detailed mathematics how this comes about.

Two long straight parallel conductors of length l ,separated by a distance d and each carrying a current I attract each other with a force equal to

A charged spherical conductor of radius a and charge q is, surrounded by another charged concentric sphere of radius b(bgta) . The potential differece between conductors is V . When, the spherical conductor of radius b is discharged completely, then the potential difference between conductor will be

A charged spherical conductor of radius a and charge q is, surrounded by another charged concentric sphere of radius b(bgta) . The potential differece between conductors is V . When, the spherical conductor of radius b is discharged completely, then the potential difference between conductor will be

A long coaxial cable consists of two concentric cylinders of radii a and b. The central conductor of the cable carries a steady current I and the outer conductor provides the return path of the current. Calculate the energy stored in the magnetic field of length l of such a cable