What is true about the magnetic field around a long straight current-carrying wire?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the Praxis Physics Exam with interactive questions and detailed explanations to enhance your understanding of physics concepts. Prepare for your exam efficiently!

Multiple Choice

What is true about the magnetic field around a long straight current-carrying wire?

Explanation:
The magnetic field around a long straight current-carrying wire depends on both the current and the distance from the wire: it grows with the current and falls off with distance as 1/r. For an infinitely long wire, the magnitude is given by B = μ0 I / (2π r). This means doubling the current doubles the field, while doubling the distance halves the field. The field lines form circles around the wire, with direction given by the right-hand rule. This behavior contrasts with a field independent of current or one that grows with distance, which do not match the way the magnetic influence of a straight current spreads in space.

The magnetic field around a long straight current-carrying wire depends on both the current and the distance from the wire: it grows with the current and falls off with distance as 1/r. For an infinitely long wire, the magnitude is given by B = μ0 I / (2π r). This means doubling the current doubles the field, while doubling the distance halves the field. The field lines form circles around the wire, with direction given by the right-hand rule. This behavior contrasts with a field independent of current or one that grows with distance, which do not match the way the magnetic influence of a straight current spreads in space.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy