NEET-XII-Physics
P1 year:2019
Qstn# 45 Prvs-Qstn
- #45A cylindrical conductor of radius R is carrying
a constant current. The plot of the magnitude
of the magnetic field. B with the distance d
from the centre of the conductor, is correctly
represented by the figure :
(1)
(2)
(3)
(4)
digAnsr: 3Ans : ( 3 )
Sol.
d
B
R dO
Inside (d < R)
Magnetic field inside conductor
μ=
0
2
i
B d
2 R
or B = Kd ...(i)
Straight line passing through origin
At surface (d = R)
μ=
0 i
B
2 R
...(ii)
Maximum at surface
Outside (d > R)
μ=
0 i
B
2 d
or 1B (Hyperbolic)
d13