In the given figure magnetic field at the center of ring `(O)` is `8sqrt(2)T` . Now it is turned through a `90^(@)` about xx` axis,so that two semicircular parts are mutually perpendicular.Find the value of magnetic field (in tesla) at centre

A circular coil with radius 10 cm and 10 no. of tightly wound identical turns is kept perpendicular to uniform magnetic field 2 xx 10^(-4) G intensity. Now, it is rotated with angular velocity 2pi "rad s"^(-1) about an axis passing through it but perpendicular to magnetic field. Then, at ........s, least time magnetic flux passing through it becomes half of maximum magnetic flux.

A current I, flowing in a long and straight wire along z-axis, is directed into two identical semicircular portions lying in y-z and x-z planes as shown in the figure. The magnetic field at the centre O is

A current I, flowing in a long and straight wire along z-axis, is directed into two identical semicircular portions lying in y-z and x-z planes as shown in the figure. The magnetic field at the centre O is

A non-conducting ring of mass m and radius R has a charge Q uniformly distributed over its circumference. The ring is placed on a rough horizontal surface such that plane of the ring is parallel to the surface. A vertical magnetic field B = B_0t^2 tesla is switched on. After 2 a from switching on the magnetic field the ring is just about to rotate about vertical axis through its centre. (a) Find friction coefficient mu between the ring and the surface. (b) If magnetic field is switched off after 4 s , then find the angle rotated by the ring before coming to stop after switching off the magnetic field.

A non-conducting ring of mass m and radius R has a charge Q uniformly distributed over its circumference. The ring is placed on a rough horizontal surface such that plane of the ring is parallel to the surface. A vertical magnetic field B = B_0t^2 tesla is switched on. After 2 a from switching on the magnetic field the ring is just about to rotate about vertical axis through its centre. (a) Find friction coefficient mu between the ring and the surface. (b) If magnetic field is switched off after 4 s , then find the angle rotated by the ring before coming to stop after switching off the magnetic field.