[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fh2oH9S4umEjvnTVx4s3BQ7sWDUbzzs9qGGmFE114VAk":3},{"id":4,"source":5,"question":6,"options":7,"answer":12,"related":13,"type":18,"origin":85,"createTime":20},47322451,"v1","Uniform magnetic field in cylindrical space changes as dB\u002Fdt = C > 0. If a straight wire and a curved wire are both placed in the changing field as shown in the figure, which one has a greater EMF in it? \u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F2c8d12f2f499bc31391be1dc96904cac.png\">",[8,9,10,11],"The straight wire","All the 3 cases are possible","they have equal EMF","the curved wire",[],[14,21,31,41,48,54,60,66,73,79],{"id":4,"source":5,"question":6,"options":15,"answer":16,"related":17,"type":18,"origin":19,"createTime":20},[8,9,10,11],[],[],0,null,"2023-06-05T16:10:54+08:00",{"id":22,"source":5,"question":23,"options":24,"answer":29,"related":30,"type":18,"origin":19,"createTime":20},47322452,"There are some statements about the electromagnetic wave. Which of them is NOT correct",[25,26,27,28],"The electric field and magnetic field caused by the wave is always perpendicular to each other","The wave speed depends on the properties of the medium in which they travel","They carry energy","They require a medium through which to propagate",[],[],{"id":32,"source":5,"question":33,"options":34,"answer":39,"related":40,"type":18,"origin":19,"createTime":20},47322453,"We can connect two inductors L1 and L2 in series to get a larger inductor. Compare the total inductance L with L1 + L2, which statement is true",[35,36,37,38],"L =L1 + L2","All the 3 results are possible","L > L1 + L2","L \u003CL1 + L2",[],[],{"id":42,"source":5,"question":43,"options":44,"answer":45,"related":46,"type":47,"origin":19,"createTime":20},47322454,"A long solenoid is compressed to 80% of its original length (without changing the number of coils N), meanwhile the current on it changes from I to 2I. How does its magnetic energy change? \u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F36ea9b909f2e36305227fd550c84375e.png\"> From U to _______×U",[],[],[],2,{"id":49,"source":5,"question":50,"options":51,"answer":52,"related":53,"type":47,"origin":19,"createTime":20},47322455,"Microwave oven uses electromagnetic wave to heat food. Suppose the space inside the oven can be treated as free space. If the electric field at point P in the oven is measured to be E=6×106 V\u002Fm, then the magnetic field at point P at the same moment is B=_________T",[],[],[],{"id":55,"source":5,"question":56,"options":57,"answer":58,"related":59,"type":47,"origin":19,"createTime":20},47322456,"\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F4e83bd9720b4046c7ac25df58ffbe2d8.png\"> \u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002Fc4f7aa428885fe94e49fe4e0679a45c9.png\">",[],[],[],{"id":61,"source":5,"question":62,"options":63,"answer":64,"related":65,"type":47,"origin":19,"createTime":20},47322457,"A semicircular wire (radius R=20cm) is moving with speed v=3m\u002Fs in the plane it lays, the moving direction is perpendicular to the diameter line (dashed line in the figure). If there is a magnetic field B=0.05T as shown in figure, how much is the EMF in the wire?\u003Cimg src=\"https:\u002F\u002Fp.ananas.chaoxing.com\u002Fstar3\u002Forigin\u002F0920611d777717d1a548a3ab88b326c7.png\"> ε = _____V",[],[],[],{"id":67,"source":5,"question":68,"options":69,"answer":70,"related":71,"type":72,"origin":19,"createTime":20},47322458,"A conductor moving in magnetic field causes a motional EMF, it can be explained by the action of Lorentz force",[],[],[],3,{"id":74,"source":5,"question":75,"options":76,"answer":77,"related":78,"type":72,"origin":19,"createTime":20},47322459,"The inductance of an electric device is independent of the electric current it carries",[],[],[],{"id":80,"source":5,"question":81,"options":82,"answer":83,"related":84,"type":72,"origin":19,"createTime":20},47322460,"The conduction current in a circuit is always continuous",[],[],[],{"courseName":86,"courseImg":87,"workName":88,"workId":89,"count":90,"courseId":91},"Physical Modelling A","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F060ff84879b2f623ef505233bbac89d7.png","变化电磁场章节作业","work_27927006",10,"c3c8a3c774ccaf53e538ec1fe9053d11"]