List of top Physics Questions on Magnetic Field on the Axis of a Circular Current Loop asked in CBSE Class XII

Derive an expression for the magnetic field \(B\), due to a circular coil of \(N\) turns, each of radius \(r\) carrying current \(I\), at a distance \(x\) from the centre along its axis.

Four long straight thin wires are held vertically at the corners \(A\), \(B\), \(C\) and \(D\) of a square of side \(a\), kept on a table and carry equal current \(I\). The wire at \(A\) carries current in upward direction whereas the current in the remaining wires flows in downward direction. The net magnetic field at the centre of the square will have the magnitude:

Derive an expression for the magnetic field \(B\), due to a circular coil of \(N\) turns, each of radius \(r\) carrying current \(I\), at a distance \(x\) from the centre along its axis.

Four long straight thin wires are held vertically at the corners \(A\), \(B\), \(C\) and \(D\) of a square of side \(a\), kept on a table and carry equal current \(I\). The wire at \(A\) carries current in upward direction whereas the current in the remaining wires flows in downward direction. The net magnetic field at the centre of the square will have the magnitude: