在如圖所示的裝置上,磁場(chǎng)垂直于光滑導(dǎo)軌平面,光滑導(dǎo)軌MN、PQ固定在水平面上,導(dǎo)體棒ab在導(dǎo)軌上做簡(jiǎn)諧運(yùn)動(dòng),產(chǎn)生交變電流的電壓表達(dá)式為u=4sin100πt,理想變壓器原副線圈匝數(shù)比為n1:n2=2:1,不計(jì)導(dǎo)軌和導(dǎo)線電阻,定值電阻R=10Ω.當(dāng)t=0.01秒時(shí),理想電流表讀數(shù)為(    )                                       

                                                               

    A.               0    B.                0.2A                    C.    0.28A      D. 0.56A

                                                                                                                                       

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科目:高中物理 來(lái)源: 題型:


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②同學(xué)們?cè)诓僮鬟^(guò)程中有如下議論,其中對(duì)減小實(shí)驗(yàn)誤差有益的說(shuō)法是             (填字母代號(hào))                     

A.兩細(xì)繩必須等長(zhǎng)                                                                                                         

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小楊同學(xué)想利用自由落體運(yùn)動(dòng)的裝置并結(jié)合機(jī)械能守恒定律來(lái)測(cè)定當(dāng)?shù)氐闹亓铀俣龋B接好打點(diǎn)計(jì)時(shí)器的電源后,學(xué)生電源面板如圖1所示,按下電源開(kāi)關(guān)后發(fā)現(xiàn)打點(diǎn)計(jì)時(shí)器不工作,經(jīng)檢查,打點(diǎn)計(jì)時(shí)器無(wú)故障,線路的連接也沒(méi)有斷路和接觸不良等問(wèn)題.

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(3)小楊同學(xué)選擇操作正確的方式打出的紙帶進(jìn)行分析,選擇計(jì)數(shù)點(diǎn)后通過(guò)對(duì)紙帶記錄的數(shù)據(jù)進(jìn)行測(cè)量和計(jì)算,得到了物體下落高度與對(duì)應(yīng)速度值,記錄在表中,小楊同學(xué)根據(jù)實(shí)驗(yàn)數(shù)據(jù)處理的需要,還計(jì)算出了速度的平方值填在表格中,請(qǐng)你選擇數(shù)據(jù)在答題紙中的方格紙上建立坐標(biāo)并描點(diǎn)作圖.

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