• 2021-04-14
    中国大学MOOC: 如图所示,两个同心的均匀带电球面,内球面带电荷量为http://edu-image.nosdn.127.net/_PhotoUploadUtils_1a817d98-063d-4766-a131-ad0a8e622565.png,外球面带电荷量为http://edu-image.nosdn.127.net/_PhotoUploadUtils_be1a3bef-84e9-450a-b0a6-bbc2f6239e52.png,则在两球面之间、距离球心O为r的P点处(OP=r)的电场强度大小E为[ ] 。http://edu-image.nosdn.127.net/D2F6A8FD010294CFD557F9989B204164.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100