This is an unmarked question.

What concepts from this part of the unit are you struggling with?  What do you feel confident in? Take your remaining quiz time and write these down to review later. You are strongly encouraged to ask questions on the topics you are struggling with on the forums.

If I push the bar to the left with a constant velocity v, what is the magnitude of the induced emf? 

What happens if, instead of moving the bar, I attach the rails to a DC voltage source? Assume the positive end of the voltage source would be along the top bar and negative end on the bottom.

A magnetic field is pointed out of the page as shown. The strength of the magnetic field is increasing. What is the direction of the induced electric field in the loop shown? 

What is the code on the screen in PACE?

Consider question 5 of the post lab quiz.

Discuss the linearisation of the data you performed, in particular for the linearisation that transformed the data into the for Y=m X+c, explain:

• what your x and y variables were (2 marks)
• what the slope m represents  (1 mark)
• what the intercept c represents  (1 mark)
• what assumption is made in order to interpret m and c as you do above  (2 marks)
• what values (with uncertainties and in the correct format) you obtain for m and c after running a fit. (2 marks)

Consider the first three questions from the post lab quiz. In these questions you explore aspects of experimental design and the impacts they have on the quality, precision and even the applicability of the experiment to testing the intended theory. 

With these questions (and any feedback you have obtained from the quiz) in mind, present a clear and self-contained method for determining the moment of inertia as you did in part A of the lab activity.  

Note that a good experimental method will enable a reader to not only follow the steps and reproduce your actions (in setting up the experiment and obtaining measurements) but also to understand the reasons for any choices made as well as understand how you have estimated any measurement uncertainties, but will also be concise. (8 marks)

In part C, you perform a fit with and . 

It is suggested the timing uncertainty for one revolution is 0.5 ms owing to the precision of the photogate timer. Indeed, the device is very precise; timing a rotation based on the precise measurement of the interval between light first passing through the hole in the disc and the next moment it does so (on the completion of a rotation). 

Is this a correct estimate for the uncertainty in time T that we take as the time for one revolution from rest?