CODE/CALC ET 3-HOLE
2nd Edition
ISBN: 9781323178522
Author: Briggs
Publisher: PEARSON
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Chapter 7.4, Problem 82E
Magnetic field due to current in a straight wire A long, straight wire of length 2L on the y-axis carries a current L. According to the Biot-Savart Law, the magnitude of the magnetic field due to the current at a point (a, 0) is given by
where μ0 is a physical constant, a > 0, and θ, r, and y are related as shown in the figure.
- a. Show that the magnitude of the magnetic field at (a, 0) is
- b. What is the magnitude of the magnetic field at (a, 0) due to an infinitely long wire (L → ∞)?
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Consider the ER diagram of online sales system above. Based on the diagram answer the questions below,
a) Based on the ER Diagram, determine the Foreign Key in the Product Table. Just mention the name of the attribute that could be the Foreign Key.
b) Mention the relationship between the Order and Customer Entities. You can use the following:
1:1, 1:M, M:1, 0:1, 1:0, M:0, 0:M
c) Is there a direct relationship that exists between Store and Customer entities? Answer Yes/No?
d) Which of the 4 Entities mention in the diagram can have a recursive relationship?
e) If a new entity Order_Details is introduced, will it be a strong entity or weak entity? If it is a weak entity, then mention its type?
No ai
Given the dependency diagram of attributes {C1,C2,C3,C4,C5) in a table shown in the
following figure, (the primary key attributes are underlined)
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