# 2021中国大学MOOC Electromagnetic Field and Microwave(电子科技大学) 最新中国大学MOOC满分章节测试答案

## CH 2 Vector Analysis Unit 2 test

1、 问题:Which one is vector field

A:Length
B:Velocity
C:Area
D:energy

2、 问题:Which one is not correct for Gradient?

A:Gradient is one of the directional derivative
B:The directional derivative of a scalar field at a certain direction is the projection of the gradient in the direction
D:Gradient is the maximum spatial rate of change of the scalar field in a point

3、 问题:Which one of the following equations is correct?

A: B: C: D: 4、 问题:Which one of the following equations does not make sense?

A: B: C: D: 5、 问题:Which one of the following formulas is identically zero?

A: B: C: D: ## CH 3 Static Electric Fields Unit 3 test

1、 问题:The parameter that can change the capacitace per unit length of the coaxial line is

A:Charge
B:Permittivity
C:permeability
D:Voltage

2、 问题:Which one is not the possible way to derive static electric field?

A:Potential function with boundary condition
B:Capacitance
C:Superposition from field element
D:Gauss’s Law

3、 问题:The electric field intensity of a positive point charge is inversely propotional to

A:the charge
B:the field position r
C:the square of the field position r
D:the third power of field position r

4、 问题:The boundary condition is the field

A:inside the conductor
B:inside the dielectric
C:in the air
D:on the interface of two media

5、 问题:The polarized surface charge density can be derived from

A: B: C: D: ## CH 4 Solution of Electrostatic Problems Unit 4 test

1、 问题:Which one of the following equations is the Poisson’s equation

A: B: C: D: 2、 问题:Which of the following is not the boundary conditions of electric potential

A: B: C: D: 3、 问题:When the angle between two grounded conducting planes is 45°，In order to analyze the field when a positive point charge is between and close to these two planes，how many image charges we need?

A:3
B:5
C:7
D:9

4、 问题:For the method of image, which one is not correct?

A:The image charge is not real charge
B:The induced charge is real charge
C:For a positive point charge closed to a grouded conducting plane, the induced charge is only negative type.