AP Physics C Electricity and Magnetism Flashcards: Amperes Law

Study Amperes Law in AP Physics C Electricity and Magnetism with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

In Ampère's Law, what is the significance of the path of integration?

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ANSWER

It encloses the current for calculating the magnetic field. The path defines which currents contribute to the magnetic field.

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AP Physics C Electricity and Magnetism: Magnetic Fields and Electromagnetism

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What this deck covers

This deck focuses on Amperes Law, giving you a quick way to review the definitions, rules, and examples that matter most for AP Physics C Electricity and Magnetism.

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Practice questions

1 of 27Practice questions for this set

A long air-core solenoid has turn density

n=1200\,\text{m}^{-1}

and carries a steady current

I=0.80\,\text{A}

. The solenoid length is much greater than its radius, so the magnetic field inside is approximately uniform and axial, and the magnetic field outside is approximately zero. Choose a rectangular Amperian loop with length

\ell

inside the solenoid parallel to the axis and the return path outside. According to Ampère's Law,

\oint \vec B\cdot d\vec \ell=\mu_0 I_{\text{enc}},

with

\mu_0=4\pi\times10^{-7}\,\text{T}\cdot\text{m/A}

. Using the symmetry assumptions, the integral reduces to

B\ell

for the inside segment, and

I_{\text{enc}}=(n\ell)I

because

n\ell

turns are enclosed. Ignore fringing and assume the current is steady. According to Ampère's Law, calculate the magnetic field inside the solenoid.

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