[" A hollow tube is carrying an electric current along its length distributed uniformly over its surface."],[" The magnetic field "]

A rubber balloon is given a charge Q distributed uniformly over its surface. Then

A rubber balloon is given a charge Q distributed uniformly over its surface. Then

A long cylinder of wire of radius 'a' carries a current i distributed uniformly over its cross section. If the magnetic fields at distances rlta and Rgta from the axis have equal magnitude, then

A long cylinder of wire of radius 'a' carries a current i distributed uniformly over its cross section. If the magnetic fields at distances rlta and Rgta from the axis have equal magnitude, then

Statement 1: A direct uniformly distributed current flows through a solid long metallic cylinder along its length. It produces magnetic field only outside the cylinder. Statement 2: A thin long cylindrical tube carrying uniformly distributed current along its length does not produce a magnetic field inside it. Moreover, a solid cylinder can be supposed to be made up of many thin cylinderical tubes.

A long thin walled pipe of radius R carries a current I along its length The current density is uniform over the circumference of the pipe The magnetic field at the center of the pipe due to quarter portion of the pipe shown, is .

A long thin walled pipe of radius R carries a current I along its length The current density is uniform over the circumference of the pipe The magnetic field at the center of the pipe due to quarter portion of the pipe shown, is .