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秘密＊启用前2020-2021学年度高二年级第一学期期中测评考试试题物理参考答案及评分参考一、单项选择题：本题包含10小题，每小题3分，共30分。�c2D4C3B5D7B6B：二二、多项选择题：本题包含5小题，每小题4分，共20分

。在每小题给出的四个选项中，至少有两个选项正确。全部选对的得4分，选对但不全的得2分，有选错的得0分。题号答案11BC12CD13BD14AC15BD三、实验探究题：本题包含2小题，共14分。16.(6分）(1)不可以(2)变小(3)变大评分参考：每空2分。17.(8分

）2.52.01.5(1)31.40(31.39-31.41)0.700(0.698-0.702)(2)心ad@如右图所示4.8(4.7-4.9)(3)5.9xl0-6(5.8Xl0-6-6.0Xl0-6)评分参考：(1)(2)每空1分、(3)每空2分。四

、计算题：本题包含4小题，共36分。18.(6分）(1)设加速匀强电场的电压为U1qU=—mv2·······················································································

······························2(2分）解得U=3.34Xl05V..................................................................

..........................................(1分）(2)设电场强度为E二dE��-.;�����;;�.:::::::::::::::::::::::::::::::::::::::::::::::::::

::::::::::::::::::::::::::::::::::::::::::::::::::::::��:�19.(9分）(!)电动机的输入功率等于电源的总功率为p•夕P=UI·····················

······································································································(2分）电动机

输出的功率等千提升重物功率P机上忒�LP机=mgv·········································································································

···············(2分）电动机线圈的内阻消耗功率P耗芦��勹。卢．．二二：二：二：：二：二：二：二：二二：二：二：二：二：二：二：：二：二：二：二：二二：��:�(2)电动机线圈的内阻为rp耗寸r··········································

·················································································(2分）解得r=2!1···························

································································································(1分）U/VIµI-1.00.5。0.10.20.30.4I/

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