Magnetic field due to currentHard
Question
A long straight wire of radius a carries a steady current i. The current is uniformly distributed across its cross section. The ratio of the magnetic field at a/2 and 2a is
Options
A.1/2
B.1/4
C.4
D.1
Solution
Here, current is uniformly distributed across the cross-section of the wire, therefore current enclosed in the amperean
path formed at a distance r1
=
× I, where Iis total current ∴ Magnetic field at
P1(B1) =
Now, magnetic field at point P2′
(B) =
∴ Required Ratio =
Create a free account to view solution
View Solution FreeMore Magnetic field due to current Questions
An infinitely long straight wire carrying current I is bent in a planer shape as shown in the diagram. The radius of the...Two concentric coils each of radius equal to 2π cm are placed at right angles to each other. 3 Ampere and 4 ampere ...A non planer loop of conduction wire carrying a current along I is placed as shown in the figure. Each of the staright s...A charged particle moves in a magnetic field = 10î with initial velocity = 5i + 4ĵ . The path of the particle ...An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the cent...