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What is the magnetic field at a distance r from a long straight wire carrying cu

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Question: What is the magnetic field at a distance r from a long straight wire carrying current I? (2020)

Options:

  1. μ₀I/(2πr)
  2. μ₀I/(4πr)
  3. μ₀I/(πr)
  4. μ₀I/(8πr)

Correct Answer: μ₀I/(2πr)

Exam Year: 2020

Solution: 

The magnetic field around a long straight wire is given by B = (μ₀I)/(2πr).

What is the magnetic field at a distance r from a long straight wire carrying cu

Practice Questions

Q1
What is the magnetic field at a distance r from a long straight wire carrying current I? (2020)
  1. μ₀I/(2πr)
  2. μ₀I/(4πr)
  3. μ₀I/(πr)
  4. μ₀I/(8πr)

Questions & Step-by-Step Solutions

What is the magnetic field at a distance r from a long straight wire carrying current I? (2020)
  • Step 1: Understand that a long straight wire carrying current creates a magnetic field around it.
  • Step 2: Identify the formula for the magnetic field (B) around the wire, which is B = (μ₀I)/(2πr).
  • Step 3: Recognize that μ₀ is a constant called the permeability of free space, I is the current in the wire, and r is the distance from the wire.
  • Step 4: Plug in the values of I and r into the formula to calculate the magnetic field B.
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