Suppose an observer is moving parallel to the wire with velocity `V_(d)` 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

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.

Figure. Shows two long wires carrying equal currents I_1 and I_2 flowing in opposite directions. Which of the arrows labeled A to D correctely represents the direction of the magnetic field due to the wires at a point located at an equal distance d from each 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 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.

An electric current passes through a long straight copper wire. At a distance of 5 cm from the straight wire, the magnetic field is B. What is the magnetic field at a distance of 20 cm from the wire ?

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

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 .

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

A wire of length 3 cm has current 1 amp. Find magnetic field at a perpendicular distance a cm from centre of wire