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Welcome to our Physics lesson on The Definition of Magnetic Induction, this is the second lesson of our suite of physics lessons covering the topic of Magnetic Field Produced by Electric Currents, you can find links to the other lessons within this tutorial and access additional physics learning resources below this lesson.
From the two experiments above (especially the second one), it is obvious that magnetic field is produced by moving electric charges. Since the current produced in this case is an induced current, we use a quantity called magnetic induction to represent quantitatively the magnetic field. Magnetic induction is a vector quantity and is denoted by B⃗ in formulae. It depends on three factors:
Mathematically, we have:
From the above formula, we can determine the unit of magnetic induction B known as Tesla, T. Thus,
In SI units, it becomes
Magnetic induction B is the quantity that represents the magnetic field. It is analogue to the electric field E or gravitational field g discussed in the previous chapters.
What is the value of magnetic induction produced by a 3A current flowing through a conducting wire which is 20 cm long? The magnetic force produced in the given point is equal to 30 N.
Clues:
F = 30 N
L = 20 cm = 0.20 m
I = 3 A
B = ?
From the definition of magnetic induction, we have
You have reached the end of Physics lesson 16.2.2 The Definition of Magnetic Induction. There are 4 lessons in this physics tutorial covering Magnetic Field Produced by Electric Currents, you can access all the lessons from this tutorial below.
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