题目:电荷量为q的正电荷,均匀分布在由绝缘材料制成的质量为m半径为R的均匀细圆环上,现设法加外力使圆环从静止开始,绕通过环心垂直于环面的轴线匀加速转动。试求从开始转动到环的角速度达到某一值ω_0的整个过程中外力所做的功。已知转动带电圆环的等效电流为I时,等效电流产生的磁场对整个圆环为周界的圆面的磁通量 Title: Charge of q positive charge, uniformly distributed in the quality of m made of insulating material with a radius m of R uniform thin ring, is now trying to increase the force from the rest of the ring, around the center of the ring around the ring perpendicular to the ring Surface of the axis of uniform rotation speed. Trying to rotate from the beginning to the ring angular velocity reaches a certain value ω_0 the whole process of external power work done. It is known that when the equivalent current of a rotating charged ring is I, the magnetic field generated by the equivalent current affects the magnetic flux of the circular plane with the entire circular ring