31.(本题7分)如题31图所示,真空中有一宽度为a的无限长薄平板,平板均匀载流,电流强度为I。P点是与平板共面且距平板右边为b的一点,求P点磁感应强度的大小和方向。
[上一页] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [下一页]
31.(本题7分)如题31图所示,真空中有一宽度为a的无限长薄平板,平板均匀载流,电流强度为I。P点是与平板共面且距平板右边为b的一点,求P点磁感应强度的大小和方向。
[上一页] [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [下一页]