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

The magnetic field at the centre of a circular current carrying coil of radius R is B. The magnetic field at a distance R from the centre on the axis of the coil is
The electric field due to an infinitely long thin wire with linear charge density \( \lambda \) at a radial distance \( r \) is proportional to:
A charged particle will continue to move in the same direction in a region, where \(E\) - Electric field, \(B\) - Magnetic field:
When an \( \alpha \) particle and a proton are projected into a perpendicular uniform magnetic field, they describe circular paths of the same radius. The ratio of their respective velocities is:
If a charged particle enters a uniform magnetic field \( B \), with a velocity \( v \) such that \( v \) has a component along \( B \), then the charged particle describes:
The ratio between the magnetic dipole moment of a revolving electron in a circular orbit to its angular momentum is (where \( e \) is the charge and \( m \) is the mass of the electron):
Similar or same magnetic fields can be produced by
Two identical magnetic dipoles of magnetic moment $2\, A\, m^2$ are placed at a separation of $2\, m$ with their axes perpendicular to each other in air. The resultant magnetic field at a midpoint between the dipoles is