Magnetism Review AP Physics 2

poles

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Terms in this set (25)

poles

two ends of an object where the magnetic effect is the strongest e.g..north pole & south pole

ferromagnetic

showing strong magnetic effects, can be permanently magnetized

magnetic field

a force field that fills the space around every magnet or current-carrying wire; (B)

tesla

(T) unit of a magnetic field (B), 1T=1N/Am

electricity&magnetism

an electric current produces a magnetic field and vice versa

right hand rule1

grasp the wire with your right hand so that your thumb points in the direction of the conventional current, and your finger will encircle the wire in the direction of the magnetic field

Force on an electric current in a magnetic field

F = BIlsinθ
direction of the current is perpendicular to the field θ=90
Fmax=BIl

Force on an electric charge moving in a magnetic field

F = q v B sinθ

right hand rule2

outstretch your fingers point along the velocity of the particle then encircle to the direction of the electric field, thumb direction is the direction of the force exerted on the positive charge(negative the opposite)

magnetic field due to current in straight line

b=μ0I/2πr

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Verified questions

health

You are a nurse at a university student health clinic. T.Q. comes in to your clinic and informs you of his immunodeficiency problem. He has just moved here to go to school. He gives you a letter from his attending physician, hands you a vial of gamma globulin, and asks you to give him his"shot."The letter from T.Q.'s physician states that he was diagnosed with primary immunodeficiency disease $18$ years ago. He has an adequate number of B cells, but they fail to mature properly and become plasma cells or immunoglobulin. T.Q. states he has a history of chronic respiratory and gastrointestinal infections. He is maintained on $0.66 \mathrm{~mL} / \mathrm{kg}$ gamma globulin IM every $3$ weeks and has tolerated this well. He has no known drug allergies. His vital signs are stable.

T.Q. returns in $3$ weeks with complaints of a stuffy nose. He is also due for his next injection of gamma globulin.

If T.Q. is developing a sinus infection, what signs are you likely to encounter on examining him?

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anatomy and physiology

Draw diagrams of the three mechanisms by which hormone secretion is controlled, including negative feedback.

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computer science

What would the following code display?

for (int count = 1; count <= 5; count++)
{
    MessageBox.Show(count.ToString());
}

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physics

Optical fibers are constructed with a cylindrical core surrounded by a sheath of cladding material. Common materials used are pure silica $\left(n_2=1.450\right)$ for the cladding and silica doped with germanium $\left(n_1=1.465\right)$ for the core.

The numerical aperture (NA) is defined as the angle of incidence $\theta_1$ at the flat end of the cable for which light is incident on the core-cladding interface at angle $\theta_{\text {crit }}$ . Show that $\sin \theta_i=\sqrt{n_r^2-n_q^2}$ .