If a circular loop of radius R carries a current I, what is the magnetic field a

Practice Questions

Q1
If a circular loop of radius R carries a current I, what is the magnetic field at the center of the loop according to Ampere's Law?
  1. μ₀I/2R
  2. μ₀I/4R
  3. μ₀I/R
  4. μ₀I/πR

Questions & Step-by-Step Solutions

If a circular loop of radius R carries a current I, what is the magnetic field at the center of the loop according to Ampere's Law?
  • Step 1: Understand that a circular loop of wire carries an electric current I.
  • Step 2: Recognize that this current creates a magnetic field around the loop.
  • Step 3: Identify that we want to find the magnetic field specifically at the center of the loop.
  • Step 4: Recall Ampere's Law, which relates the magnetic field to the current and the geometry of the loop.
  • Step 5: Use the formula for the magnetic field at the center of a circular loop: B = (μ₀I)/(2R).
  • Step 6: In this formula, μ₀ is the permeability of free space, I is the current, and R is the radius of the loop.
  • Step 7: Substitute the values of I and R into the formula to calculate the magnetic field B.
  • Ampere's Law – Ampere's Law relates the integrated magnetic field around a closed loop to the electric current passing through the loop.
  • Magnetic Field of a Current Loop – The magnetic field at the center of a circular current-carrying loop can be derived from Ampere's Law and is dependent on the current and radius of the loop.
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