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1、高二物理电场力练习题ExercisesofphysicalforceofelectricfieldinSeniorTwoQuestionAuthor:ZhangXiaofengusedate:October1stAchoice(thetitleof10items,eachitemof6points,atotalof60points)1.,thetwosmallersphereswiththesamechargewerereleasedatthesametimebythestationary(smallspheresplacedonthesmoothinsul
2、atedhorizontalplane),whichactedonlyduringthecourseoftheinteractionbetweentheCoulombforcesA.theirinteractionforceisdecreasingbyB.,andtheiraccelerationratiodecreasesconstantlyC.thesumoftheirmomentumincreasesbyD.,andtheirkineticenergyincreasescontinuously2.,acertainamountofQisdividedi
3、ntoQand(Q-q),whenthedistanceiscertain,theinteractionforceisthemaximum,thentheQvalueshouldbeA.Q/2B.Q/3C.Q/4D.Q/5chartFigure33.asshowninFigure3,thesmalldiscAlevelfixed,chargedamountisQ,thepotentialiszero,fromthedisccenterat0isreleasedfromrestamassofM,amountofchargewas+Qball,becauseof
4、theeffectofelectricfield,Cpointcenterverticallineheightuptotheballupwardonthedisc・OC二h,andthatBpointverticallinewhentheballspeed,thusformedintheQfield,thephysicalquantityiscertainA.bpoint,fieldstrength,B.cpoint,fieldstrengthC.bpointpotentialD.cpointpotentialAsfigure4.shows,thewires
5、uspensionhungapositivelychargedball,itsqualityism,powerisQ,thedeviceisinauniformelectricfieldtotherightlevelofelectricfieldstrengthisE.thefollowingstatementiscorrectWhentheAballisbalanced,thetangentanglebetweenthesuspensionlineandtheverticaldirectionisEq/mgBifyoucutthesuspensionlin
6、e,theballwilldocurvemotionC.ifthelineiscut,theballwillmoveataconstantspeedD.ifthelineiscut,thentheballwilldoauniformaccelerationoflinearmotion5.twofreemovementpointchargewereplacedinA,Btwo,asshowninFigure5,AQI,BchargepositivechargeandthenegativelychargedQ2,Q2二4Q1,anotherpointcancha
7、rgeQ3freemobile,ABontheline,tomakethewholethesystemisinequilibrium,thenA.Q3isanegativecharge,andputintheAB.Q3totheleftisanegativecharge,andputintheB.C.Q3isapositivecharge,placedbetweenAB,D・Q3ispositivecharge,andplacedontherightsideofB5.asshowninanelectricfield,a,B,C,D,fourpoints,re
8、spectively,areintroducedto
