List of top Physics Questions on Magnetic Field Due To A Current Element, Biot-Savart Law asked in CBSE CLASS XII

A long straight wire of circular cross-section (radius \(a\)) carries a steady current \(I\). The current is uniformly distributed across this cross-section. The magnitude of the magnetic field produced at a point at a distance \(\dfrac{a}{2}\) from the axis of the wire will be

A long straight wire of circular cross-section (radius \(a\)) carries a steady current \(I\). The current is uniformly distributed across this cross-section. The magnitude of the magnetic field produced at a point at a distance \(\dfrac{a}{2}\) from the axis of the wire will be

In a circular loop of radius \( R \), current \( I \) enters at point \( A \) and exits at point \( B \), as shown in the figure. The value of the magnetic field at the centre \( O \) of the loop is: