答案:D
We only had $100 and that was ________ to buy a new computer.[ ]
A. nowhere near enough
B. near enough nowhere
C. enough near nowhere
D. near nowhere enough
流I=2.0A,方向向左,导体棒受到的安培力大小为4×10-3N求:
(1)安培力的方向如何?
(2)磁感应强度大小。
(3)若导体棒中电流大小为3A,则导体棒所受安培力多大?