A long solid cylindrical conductor of radius R is carrying a constant current I. The variation of magnetic field due to this conductor is given by `B={((Klr)/(R^(2)),r le R),((kl)/(r), r gt R):}`
Here k is a constant and r = distance between the axis of the conductor and the point at which magnetic field is given.
Which of the following plots is correct regarding themagnitude of magnetic field B with disatance ?

Answer

D

Explanation

For `r le r, B prop r` i.e. plot will be straight line.
For `r le R,B prop (1)/(r)` i.e, plot will be rectangular hyperbola.