For a small circular current loop magnitude of magnetic field in the plane of the loop at a point distant x from centre of loop (x >> R and magnetic dipole moment of loop is m = IA) is

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Q. Assertion :A planar circular loop of area A and carrying current I is equivalent to magnetic dipole of dipole moment M

=

IA. Reason: At large distances, magnetic field of circular loop and magnetic dipole is same.

Q. A square loop is carrying a steady current I and the magnitude of its magnetic dipole moment is m. If this square loop is changed to a circular loop and it carries the same current, the magnitude of the magnetic dipole moment of circular loop will be :

Q. The dipole moment of a circular loop carrying a current

I

m

and the magnetic field at the centre of the loop is

B_{1}

. When the dipole moment is double by keeping the current constant, the magnetic field at the centre of loop is

B_{2}

. The ratio

\frac{B_{1}}{B_{2}}

State Biot – Savart law. Deduce the expression for the magnetic field at a point on the axis of a current carrying circular loop of radius ‘R’ at a distance ‘x’ from the centre. Hence, write the magnetic field at the centre of a loop.

Q. Due to the flow of current in a circular loop of radius

R

, the magnetic field produced at the centre of the loop is

B

. The magnetic moment of the loop is:-

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