A long insulated copper wire is closely wound as a spiral of `N` turns. The spiral has inner radius a and outer radius `b`. The spiral lies in the `xy`-plane and a steady current I flows through the wire. The`z`-component of the magetic field at the centre of the spiral is
A
`(mu_(0)NI)/(2(b -a)) ln((b)/(a))`
B
`(mu_(0)NI)/(2(b -a)) ln((b+a)/(b-a))`
C
`(mu_(0)NI)/(2b) ln((b)/(a))`
D
`(mu_(0)NI)/(2b) ln((b+a)/(b-a))`
Text Solution
Verified by Experts
The correct Answer is:
A
Topper's Solved these Questions
MOVING CHARGES AND MAGNETISM
SUNIL BATRA (41 YEARS IITJEE PHYSICS)|Exercise MCQs(d )|1 Videos
SUNIL BATRA (41 YEARS IITJEE PHYSICS)|Exercise JEE Main And Advanced|209 Videos
Similar Questions
Explore conceptually related problems
The magnetic field at the centre of a tightly wound spiral coil with inner radius R and outer radius 4.5 R with number of turns 22, when current i is flowing through it, is
A toroid of core of inner radius 0.25 m and outer radius 0.26 m around which 3500 turns of a wire are wound. If the current in the wire is 11 A, then magnetic field inside the core of the toroid is
A coil having N turns is would tightly in the form of a spiral with inner and outer radii a and b respectively. When a current I passes through the coil, the magnetic field at the centre is.
A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of
A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 21is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of
A circular coil 'A' has a radius R and the current flowing through it is I.Another circular coil 'B' has a radius 2R and if 21is the current flowing through it then the magnetic fields at the centre of the circular coil are in the ratio of
A coil having N turns is wound tightly in the form of a spiral with inner and outer radii a and b respectively. A current I passes through the coil. The magnetic moment of the spriral is
SUNIL BATRA (41 YEARS IITJEE PHYSICS)-MOVING CHARGES AND MAGNETISM-MCQs(d )
