中国大学MOOC: 如图所示，两根相互平行的无限长均匀带正电的直导线1、2，两者相距为d，其电荷密度分别为http://edu-image.nosdn.127.net/_PhotoUploadUtils_8c2e93e2-f8ff-44e5-9082-ce7f9e2ce511.png、http://edu-image.nosdn.127.net/_PhotoUploadUtils_bb706ae4-d741-4b50-9e28-164193d0518d.png，则场强为零的点离导线1的距离为[ ] 。http://edu-image.nosdn.127.net/E0BC47409ADB25D01E1D697B518BC2E3.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100
举一反三
- [img src="http://edu-image.nosdn.127.net/C2E222B9B69051B791D85D50DD8FFB80.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"] A: -1 B: 1 C: 2 D: 0
- [img src="http://edu-image.nosdn.127.net/E524966EFC5273037E2615670F2A060E.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"] A: 1 B: 2 C: 3 D: 4
- [img src="http://edu-image.nosdn.127.net/C8EC0B0C890042F81AB9CF0941243122.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"] 未知类型：{'options': ['2', '0', '1', '[img src="http://edu-image.nosdn.127.net/EAB437E744FF87F763873F106CCCE3E9.bmp?imageView&type=jpeg&thumbnail=890x0&quality=100"]'], 'type': 102}
- [img src="http://edu-image.nosdn.127.net/08446072FAF419F6F5FB52568347381A.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100"][img src="http://edu-image.nosdn.127.net/950BA54637600A69A19C15A66AC36500.bmp?imageView&type=jpeg&thumbnail=520x520&quality=100"] A: -4 B: +2 C: -1 D: -2
- 如图7所示,两根无限长均匀带正电的直导线1、2相互平行,相距为d,其电荷密度为。则() A: 场强为零的点应在两根直导线中间的某点 B: 场强为零的点应在两根直导线之外的某点 C: 没有一个点场强为零 D: 无法判断