CBSE Class 12-science Answered
What happens to the magnetic field of the coil on its axis at a point very very far away from its centre, if the radius of the coil is doubled keeping the current flowing through it unchanged?
Asked by Topperlearning User | 18 May, 2015, 03:37: PM
Expert Answer
The magnetic field at a point on the axis of the coil is given by
If the point lies very very far away , then x>>a
Therefore, 
………………………..1
From Eq.1 if we double the radius (a) of the coil, the field becomes four times.
Answered by | 18 May, 2015, 05:37: PM
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