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单选题 There are some statements about the electromagnetic wave. Which of them is NOT correct
学科：Physical Modelling A
时间：2023-06-05 08:10:54
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题目1单选题
Uniform magnetic field in cylindrical space changes as dB/dt = 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? <img src="https://p.ananas.chaoxing.com/star3/origin/2c8d12f2f499bc31391be1dc96904cac.png">A. The straight wireB. All the 3 cases are possibleC. they have equal EMFD. the curved wire
题目2单选题
There are some statements about the electromagnetic wave. Which of them is NOT correctA. The electric field and magnetic field caused by the wave is always perpendicular to each otherB. The wave speed depends on the properties of the medium in which they travelC. They carry energyD. They require a medium through which to propagate
题目3单选题
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 trueA. L =L1 + L2B. All the 3 results are possibleC. L > L1 + L2D. L <L1 + L2
题目4填空题
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? <img src="https://p.ananas.chaoxing.com/star3/origin/36ea9b909f2e36305227fd550c84375e.png"> From U to _______×U题目5填空题
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/m, then the magnetic field at point P at the same moment is B=_________T题目6填空题
<img src="https://p.ananas.chaoxing.com/star3/origin/4e83bd9720b4046c7ac25df58ffbe2d8.png"> <img src="https://p.ananas.chaoxing.com/star3/origin/c4f7aa428885fe94e49fe4e0679a45c9.png">题目7填空题
A semicircular wire (radius R=20cm) is moving with speed v=3m/s 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?<img src="https://p.ananas.chaoxing.com/star3/origin/0920611d777717d1a548a3ab88b326c7.png"> ε = _____V题目8判断题
A conductor moving in magnetic field causes a motional EMF, it can be explained by the action of Lorentz force题目9判断题
The inductance of an electric device is independent of the electric current it carries题目10判断题
The conduction current in a circuit is always continuous下载 题海APP
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