The magnetic field normal to the plane of a coil of 
turns and radius 
which carries a current 
is measured on the axis of the coil at a distance 
from the centre of the coil. This is smaller than the field at the centre by the fraction,
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
We have 
[From Binomial theorem, 
]
From Eq. (ii), it is clear that the magnetic field on the axis is smaller than the field at the centre by a fraction 
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
The distance moved by a charged particle along the magnetic field (the component of velocity is par…
If ' ' is electric charge, is magnetic field, ' ' is the dee radius and ' ' is the mass of ions…
A charged particle when enters a uniform magnetic field moves in a helical path. If its angular vel…
The magnetic force is
A charge ' ' moves with a velocity along -axis in a uniform magnetic field , then charge will e…
An observer at rest experiences an electric field due to a static charge. Later he starts moving aw…