A straight round copper conductor of radius `R = 5.0 mm` carries a current `I = 50 A` Find the potentail difference between the axis of the conductor and its surface. The concentration of the conduction electrons in copper is equal to `n = 0.9.10^(33) cm^(-3)`.

A uniform straight conductor of radius 0.25 mm carries a steady current of 2A .Calculate the current density in it.

A conductor carries a current of 0.4 A when a potential difference of 10 V is applied across it. Find its resistance.

A long straight solid conductor of radius 5 cm carries a current of 2A, which is uniformly distributed over its circular cross section. Find the magnetic field at a distance of 3 cm from the axis of the conductor.

A long straight solid conductor of radius 5 cm carries a current of 2A, which is uniformly distributed over its circular cross section. Find the magnetic field at a distance of 3 cm from the axis of the conductor.

A long straight solid conductor of radius 5cm carries a current of 3A , which is uniformly distributed over its circular cross-section. Find the magnetic field induction at a distance 4cm from the axis of the conductor. Relative permeability of the conductor=1000.

A homongeous proton beam acceletated by a potentiail difference V = 600 kV has a round cross-section of radius r = 5.0 mm . Find the electric fiel dstrength on the surface of the beam and the potentia difference between the surface of the beam and the potential difference between the surface and the axis of the beam if the beam current is equal to I = 50 mA .