中国大学MOOC: 真空中无限长载流导线被折成两直线段和四分之一圆弧部分，形状如图所示，导线中电流强度为I，圆弧半径为R。圆心O点的磁感应强度的大小为 http://edu-image.nosdn.127.net/54A0675579837DAC78DD16EFB394EDEE.png?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/8F22484321CEF001581F8E0C583A0FC6.png?imageView&thumbnail=890x0&quality=100
举一反三
- 中国大学MOOC: 一无限长载流 I 的导线，中部弯成如图所示的四分之一圆周 AB，圆心为O，半径为R，则在O点处的磁感应强度的大小为http://edu-image.nosdn.127.net/2A9F8A19CF13711B272A4597E78BB82C.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC:"下图所示工具为（ ）。http://edu-image.nosdn.127.net/D6BFA044A165F7787DDF229A39C5C236.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/2F463E8BC7003C7A6DE10AD41DB2F19E.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/A703FA1F4FAFAE1A1224262AF1D87971.jpg?imageView&thumbnail=890x0&quality=100";
- 中国大学MOOC: http://edu-image.nosdn.127.net/8E989C885179CAD3E88F4ED14999CEF9.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/270D935AC13F8AC30775CB323882970C.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/E8F4932FC8C534FE91D7CCBE9744E7AD.jpg?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: 设一通有电流I的半径为R的圆形线圈，在其圆心处的磁感应强度大小为http://edu-image.nosdn.127.net/_PhotoUploadUtils_160877ac-6f7b-43a6-b6b0-ae328a100432.png，另一根通有电流I的电线被弯成如图所示的形状，其半圆的半径也为R，则O点处的磁感应强度大小为[ ]。http://edu-image.nosdn.127.net/23FF01F06FC449725D4F0C1FC1C88A62.png?imageView&thumbnail=890x0&quality=100
- 中国大学MOOC: http://edu-image.nosdn.127.net/8E989C885179CAD3E88F4ED14999CEF9.jpg?imageView&thumbnail=890x0&quality=100http://edu-image.nosdn.127.net/270D935AC13F8AC30775CB323882970C.jpg?imageView&thumbnail=890x0&quality=100