Physics-
General
Easy
Question
Curves in the graph shown give, as functions of radial distance r, the magnitude B of the magnetic field inside and outside four long wires a, b, c and d, carrying currents that are uniformly distributed across the cross sections of the wires. Overlapping portions of the plots are indicated by double labels.
Which wire has the greatest radius ?
- a
- b
- c
- d
The correct answer is: c
Inside the cylinder
Inside cylinder B 
r and outside 
So from surface nature of mag field changes. Hence it is clear from the graph that wire 'c' has greatest radius
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