A wooden stick of length `3l` is rotated about an end with constant angular velocity `omega` in a uniform magnetic field `B` perpendicular to the plane of motion. If the upper one-third of its length is coated with copper, the potential difference across the whole length of the stick is

A conducting rod of length l is rotating with constant angular velocity omega about point O in a uniform magnetic field B as shown in the figure . What is the emf induced between ends P and Q ?

(a) A metal rod of length L rotates about an end with a uniform angular velocity omega . A uniform magnetic field B exists in the direction of the axis of rotation. Calculate the emf induced between the ends of the rod. Neglect the centripetal force acting on the free electrons as they move in circular paths. (b) A rod of length L rotates with a small but uniform angular velocity omega about its perpendicular bisector. A uniform magnetic field B exists parallel to the axis of rotation. Find the potential difference (i) between the centre of rod and one end and (ii) between the two ends of the rod.

A metal rod length l rotates about on end with a uniform angular velocity omega . A uniform magnetic field vecB exists in the direction of the axis of rotation. Calculate the emf induced between the ends of the rod. Neglect the centripetal force acting on the free electrons as they money in circular paths.

A conducting disc of radius r rotaes with a small but constant angular velocity omega about its axis. A uniform magnetic field B exists parallel to the axis of rotation. Find the motional emf between the centre and the periphery of the disc.

Rod PQ of length 2l is rotating about one end P in a uniform magnetic field B which is perpendicular to the plane of rotation of the rod . Point M is the mid- point of the rod. Find the induced emf between M and Q if the potential between P and Q is 100 V .