匀强磁场中有一段长为0.1m的直导线,它与磁场方向垂直,当通过2A的电流时,受到 6 ×10 -2 N 的磁场力,则磁场的磁感应强度是_______;当导线长度减少一半时,磁场的磁感应强度是_________;当通入的电流加倍时,磁场的磁感应强度是________。
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