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$\bullet$ A current in a long, straight wire produces a magnetic field of 8.0$\mu$ t at 2.0 $\mathrm{cm}$ from the wire's center. Answer the following questions without finding the current: (a) What is the magnetic field strength 4.0 $\mathrm{cm}$ from the wire's center? (b) How far from the wire's center will the field be 1.0$\mu \mathrm{T} ?$ (c) If the current were doubled, what would the field be 2.0 $\mathrm{cm}$ from the wire's center?

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Physics 101 Mechanics

Physics 102 Electricity and Magnetism

Chapter 20

Magnetic Field and Magnetic Force

Motion Along a Straight Line

Motion in 2d or 3d

Electric Charge and Electric Field

Gauss's Law

Current, Resistance, and Electromotive Force

Direct-Current Circuits

Magnetic Field and Magnetic Forces

Sources of Magnetic field

Electromagnetic Induction

Inductance

Cornell University

Rutgers, The State University of New Jersey

University of Winnipeg

McMaster University

Lectures

18:38

In physics, electric flux is a measure of the quantity of electric charge passing through a surface. It is used in the study of electromagnetic radiation. The SI unit of electric flux is the weber (symbol: Wb). The electric flux through a surface is calculated by dividing the electric charge passing through the surface by the area of the surface, and multiplying by the permittivity of free space (the permittivity of vacuum is used in the case of a vacuum). The electric flux through a closed surface is zero, by Gauss's law.

04:28

A magnetic field is a mathematical description of the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude (or strength); as such it is a vector field. The term is used for two distinct but closely related fields denoted by the symbols B and H. The term "magnetic field" is often used to refer to the B field. In a vacuum, B and H are the same, whereas in a material medium, B is a component of H. In the latter case, H is the "magnetic field strength", and B is the "magnetic flux".

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but a off the human problem. We had asked him if we have a to market this law. Ah, maybe field at the two centimeter from a wire center. What will be demanding? Feel that the four centimeter at the force of duty? This will be simply for micro Tesla, um or otherwise. We can do it by using any question that he's musical immune on I divided by two by our. So we'll substitute the values and get there. This factor, this whole factor will be called to 16. So if we divide this 16 by your four, we get or b will be four micro testicle, which we said earlier for Part B similarly will use the same procedure to calculate. Ah, the art which will get a 16 centimeter. And for part C, we'll have ah invented field off for using the same equation will complete it, which will get 16 micro Tesla

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