The value of magnetic field at the centre of a circular loop is ___________.

The correct answer is option 3

Key Points

• The formula for the magnetic field at the center of a circular loop is B = (μ₀I)/(2R).
• This formula is derived from the Biot-Savart law.
• Where μ₀ is the permeability of free space, I is the current, and R is the radius of the loop.
• The magnetic field is directly proportional to the current and inversely proportional to the radius.

Important Points

• The magnetic field at the center of a circular loop is uniform and directed perpendicular to the plane of the loop.
• The direction of the magnetic field follows the right-hand rule.
• Increasing the current or decreasing the radius will increase the magnitude of the magnetic field.
• This formula is essential for understanding magnetic fields in circular loops, which is a fundamental concept in electromagnetism.