试题与答案

在实验精度要求不高的情况下,可利用罗盘来测量电流产生磁场的磁感应强度。具体做法是

题型:选择题

题目:

在实验精度要求不高的情况下,可利用罗盘来测量电流产生磁场的磁感应强度。具体做法是:在一根南北方向放置的直导线的正下方10cm处放一个罗盘。导线没有通电时罗盘的指针(小磁针的N极)指向北方;当给导线通入电流时,发现罗盘的指针偏转一定角度,根据偏转角度即可测定电流磁场的磁感应强度。现已测出此地的地磁场水平分量Be=5.0×10-5 T,通电后罗盘指针停在北偏东60°的位置(如图所示)。由此测出该通电直导线在其正下方10cm处产生磁场的磁感应强度大小为

[ ]

A.5.0×10-5 T

B.1.0×10-4 T

C.8.66×10-5 T

D.7.07×10-5 T

答案:

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题型:阅读理解

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C.play on the beach

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A.in the pool

B.out of the water

C.making a big noise

D.swimming in the water小题3:What’s the best title for the passage?

A.Weather

B.Birds

C.Sea

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