SCIENCE,PHYSICS
posted by kk .
A thin ring with resistance R=10 Ω and self inductance L=0.2 H rotates with constant angular speed ω=100 rad/s in an external uniform magnetic field perpendicular to the rotation axis. As a result, the magnetic flux created by the external field varies with time as
Φ(t)=Φ0cos(ωt)whereΦ0=0.1 Wb.
Because of the resistance of the ring, energy is being continuously dissipated in the system. What average power Pˉ in Watts must develop the external forces to keep the ring rotating at constant angular speed ω (on average).
Respond to this Question
Similar Questions

physics
A rectangular loop with 100 turns and area of 0.12 m2 rotates at 100 rad/s. The axis of rotation of the square is perpendicular to the direction of the magnetic field of 0.025 Tesla. What is the maximum emf induced in the loop? 
Physics
A rectangular coil of 70 turns, dimensions 0.100 m by 0.200 m and total resistance 10.0 ohms, rotates with angular speed 32.0 rad/s about the y axis in a region where a 1.00 T magnetic field is directed along the x axis. The rotation … 
Physics
A circular loop with 30 turns and area of 0.25 m2 rotates at 100 rad/s. The axis of rotation of the loop is perpendicular to the direction of the magnetic field of 0.04 Tesla. What is the maximum emf induced in the loop? 
Physics PLEASE HELP!
A flat circular coil with 97 turns, a radius of 4.04 102 m, and a resistance of 0.528 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic … 
Physics :(( help please TT
A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic field … 
SIMPLE physics!!!!!!
A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic field … 
physics
A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic fieldĀ in … 
Physics
A spherical shell of radius R carries a uniform surface charge density (charge per unit area) σ. The center of the sphere is at the origin and the shell rotates with angular velocity ω (in rad/sec) around the zaxis (z=0 … 
physics
A flat circular coil with 113 turns, a radius of 3.64 102 m, and a resistance of 0.524 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic … 
Physics
A flat circular coil with 193 turns, a radius of 5.50 x 102 m, and a resistance of 0.241 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic …