5/19 Week 13 day 1 Electromagnetic Induction, Induction, Faraday's Law, Maxwell's Equations

ActivPhysics 13.9: Electromagnetic Induction

at the beginning of the class, we did  these 13 questions about Magnetic Flux, EMF, 

There are answers of the first three photos. 
Magnetism and Electric Current

 

Then the professor shows us a experiment. The equipment are in the first photo. and when we give the current in the copper stick, the stick will move . The motion is in the video. Then we change the direction of the current, we find that the stick will move in the opposite direction.

 In this photo, we draw the graph of the experiment and clearly shows that if the current is inverse, the force is inverse and the direction of stick is inverse.

ActivPhysics 13.10: Motional EMF

 

Then we answers another question online about Motional EMF.

Then we answers 13 questions in this photo.

Self Inductance and a Solenoid

In this photo, we use the equation V=L*dI/dt and V=RI, C=Q/V  to find that V=1/C*div(I)dt. 

 Then we use the equation B=u*NI.L_length and Flux= NBAcos(theta) and E=-dFlux/dt  to find that L= u*N^2*A/L_length.

In this photo, we use the equation we just find to solve a question and we calculate that L=9.87*10^-7

Current Flow Through an Inductor

In this photo, we find that the unit of L is kg*m^2/C^2

Then we begin to learn RC circle. In this photo, we draw a graph about an inductor , an battery and a switch. and Draw the graph about the I vs t. about this graph. at the beginning , when t increases, the V and I are 0, and then the I and V increases rapidly large.

In this photo,the professor shows us how to find the constant , and we find that T= L/R

ActivPhysics 14.1: The RL Circuit

In this photo, we uses the constant t=L/ R  to answers the 8quesitons.

Conclusion:

Today in class, we learned that any current supplied will cause an induced back emf going the opposite direction as the emf supplied by the battery. we looked at three different situations related to induction and analyzed every factor related to induction in a circuit. We did lots with the in class activities to run through the memory for the test. We looked at EMF, flux, magnetism, resistance, and inductors themselves and analyzed and calculated how they're all related and how they affect one another. we learned about inductors and identified that inductors are useful in magnetic fields in order to store energy when there is a current supplied. We learned and reviewed a lot in class about all the laws like Gauss' Law, Faraday's Law, Amperes' Law. We learned using the number of coils, area, and length the idea of self-inductance and solenoids.