Suppose an observer is moving parallel to the wire with a velocity '`v`', such that electrons are at rest for this observer the magnetic field produced by electrons at a point at a distance '`x`' from the wire is :

Consider the magnetic field produced by a finitely long current carrying wire .

Suppose that the current density in a wire of radius a varius with r according to Kr^2 where K is a constant and r is the distance from the axis of the wire. Find the magnetic field at a point at distance r form the axis when (a) r lt a and (b) r gt a.

A rod of length l is placed perpendicular to a long wire carrying current i . The rod is moved parallel to the wire with a velocity v . Find the emf induced in the rod, if its nearest end is at a distance a from the wire.

A rod of length l is placed perpendicular to a long wire carrying current i . The rod is moved parallel to the wire with a velocity v . Find the emf induced in the rod, if its nearest end is at a distance a from the wire.

A negative charge is coming towards the observer. The direction of the magnetic field produced by it will be (as seen by observer)

A rod of length l is kept parallel to a long wire carrying constant current i . It is moving away from the wire with a velocity v. Find the emf induced in the wire when its distance in the wire when its distance from the long wire is x .

An electric current flows in a wire from north to south. What will be the direction of the magnetic field due to this wire at a point.

If an electron enters a magnetic field with its velocity pointing in the same direction as the magnetic field, then

If an electron is moving with velocity v produces a magnetic field vecB , then

Two long parallel wires carry equal current I flowing in the same direction are at a distance 2d apart. The magnetic field B at a point lying on the perpendicular line joining the wires and at a distance x from the midpoint is